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False Memory
Background
It's a common intuition that memory is like a video camera: we
store a copy of whatever we were experiencing, and later we
remember by playing it back. Among the many reasons this
view of memory is incorrect is that it assumes our memory is
always, or at least very often, accurate. But in fact, not only is
memory inaccurate, it's often less accurate than we think: we
might be very confident in a memory only to realize it was
totally wrong.
One way memory can be distorted is through misinformation.
Loftus and Palmer (1974) showed participants a video clip of a
car accident, then asked them to estimate the speed of one car in
the video. However, one group of participants was asked how
fast the car was going when it "smashed into" the other car,
while the second group was asked how fast the car was going
when it "hit" the other car. Participants who were asked the
"smashed" question estimated much higher speeds than those
asked the "hit" question, even though both groups of
participants saw the same video--suggesting that memories can
be distorted by how questions about the memory are framed.
Worse still, we can be poor judges of our own memory
accuracy: in one study of vivid, emotional flashbulb memories,
confidence in the memories was extremely high, but those high-
confidence memories were not any more accurate than typical
memories (Talarico & Rubin, 2003).
We can also experience entirely false memories. In the Deese-
Roediger-McDermott paradigm (Deese, 1959; Roediger &
McDermott, 1995), participants see lists of words that are all
related to a single "critical" word. For example, if the critical
word was candy, participants might see words like sweet,
chocolate, or bar. The important part of the paradigm is that the
critical word ("candy") is never presented to participants.
Despite this, when asked to recall words later, many
participants will falsely remember seeing the critical word, and
most will be confident that their recollection is accurate.
Mostly, these misinformation and false memory effects happen
because remembering is reconstructive. We don't just press
"play" on a video recording of the event; when we remember
our brain is filling gaps and details and context every time we
recall the event. Remembering is an active process, not the
passive "playback" of recorded information, and that has
practical implications. Consider that, when polled, people
serving on a jury overwhelmingly indicate that eyewitness
testimony is the most compelling evidence when trying to
decide whether a defendant is guilty. But based on false
memory and other memory distortions, shouldn't jury members
be much less trusting of eyewitness testimony than they are? If
confidence is not as associated with memory accuracy as we
think, then it becomes difficult to determine whose testimony to
believe. And moreover, if memory is reconstructive, then the
mere act of recalling the event may distort the memory, further
clouding the issue.
Sequence of Events
The basic trial sequence for the encoding phase is as follows.
Instructions are presented at the beginning of the experiment.
Fixation Point
Duration determined by Fixation Point Duration
Study Stimulus
Duration determined by Study Stimulus Duration
ITI
Duration determined by ITI Durations
The basic trial sequence for the Recognition test is as follows.
Fixation Point
Duration determined by Recognition Test Fixation Point
Duration
Test Stimulus
Maximum duration determined by Maximum Allowable RT
Feedback
Feedback on response accuracy can be displayed
ITI
Duration determined by ITI Durations
Results and Output
For each participant, three tab-delimited text data files are
saved in the Logfiles folder. The .log file (filename "Subject-
Experiment Name.log") is a standard Presentation logfile and
contains detailed information about every event and response
that occurred during the experiment. The summary file
(filename: "Subject-Experiment Name-Summary.txt") contains
simple summary statistics (e.g., accuracy, RT) for relevant
experiment conditions. The remaining file contains trial-level
data. This is the file that would typically be used for running
simple analyses. A brief example of this file and description of
the column headings follows. Note that two tables are printed,
one for encoding trials and one for test trials.
Column heading list for Encoding trials:
Block
Identifies trial as Encoding
Trial Number
Trial number in the encoding block
Study Word
Study stimulus
Word Group
Word group/word list of the study stimulus
Word Number
Word number (1-15) of the study stimulus
Column heading list for Recognition trials:
Block
Identifies trial as Recognition
Trial Number
Trial number in the test block
Word Group
Word group the test stimulus belongs to
Word Number
Word number (1-15) of the test word
Test Word
Test stimulus
Word Condition
Target, Distractor, or Critical Word
Response
Participant's response (2 = "old", 3 = "new")
Accuracy
Old/new response accuracy
RT
Reaction time (in ms) for the old/new response
Configurations
Free Recall (default)
Based on the free-recall version as in Roediger and McDermott
(1995). Participants study 12 lists of 15 words each, performing
a free-recall task after studying each list.
Recognition
Based on a recognition version of the experiment as conducted
by Roediger and McDermott (1995). Participants study six lists
of 15 words, then do a recognition memory task in which the
critical word for each list is also presented.
Stimuli
Stimuli are taken from a tab-delimited text file. The text file
should contain 16 columns. Each row represents one word list,
with the first column being the "critical" word, and the
subsequent columns being the related words, listed in
descending order of relatedness.
Port Codes
The table below describes how port codes are assigned to
responses and stimulus events (if port codes are sent). In
general, responses will have port codes less than 10, and
stimulus events will have port codes 10 or higher. Note that
based on parameter settings, some of the events listed below
may not occur in the experiment.
1
Enter key
2
Left mouse button
3
Right mouse button
10
Fixation point onset
20
Study Word onset
20
Test Word onset (recognition test)
Translations
Translations are included for the following languages: English,
Spanish, German, French, Chinese, and Japanese. Use the
Language parameter to select an available translation. A
'Custom' language file (and associated stimulus files, if
necessary) is included for all experiments that can be modified
to create new translations. Some experiments contain captions
that should be translated manually as part of a parameter (for
example, a statement describing a target stimulus or position).
For this experiment, you should check the following parameters
for those captions: Correct Feedback Caption and Incorrect
Feedback Caption.
False Memory
Background
It's a common intuition that memory is like a video camera: we
store a copy of whatever we were experiencing, and later we
remember by playing it back. Among the many reasons this
view of memory is incorrect is that it assumes our memory is
always, or at least very often, accurate. But in fact, not only is
memory inaccurate, it's often less accurate than we think: we
might be very confident in a memory only to realize it was
totally wrong.
One way memory can be distorted is through misinformation.
Loftus and Palmer (1974) showed participants a video clip of a
car accident, then asked them to estimate the speed of one car in
the video. However, one group of participants was asked how
fast the car was going when it "smashed into" the other car,
while the second group was asked how fast the car was going
when it "hit" the other car. Participants who were asked the
"smashed" question estimated much higher speeds than those
asked the "hit" question, even though both groups of
participants saw the same video--suggesting that memories can
be distorted by how questions about the memory are framed.
Worse still, we can be poor judges of our own memory
accuracy: in one study of vivid, emotional flashbulb memories,
confidence in the memories was extremely high, but those high-
confidence memories were not any more accurate than typical
memories (Talarico & Rubin, 2003).
We can also experience entirely false memories. In the Deese-
Roediger-McDermott paradigm (Deese, 1959; Roediger &
McDermott, 1995), participants see lists of words that are all
related to a single "critical" word. For example, if the critical
word was candy, participants might see words like sweet,
chocolate, or bar. The important part of the paradigm is that the
critical word ("candy") is never presented to participants.
Despite this, when asked to recall words later, many
participants will falsely remember seeing the critical word, and
most will be confident that their recollection is accurate.
Mostly, these misinformation and false memory effects happen
because remembering is reconstructive. We don't just press
"play" on a video recording of the event; when we remember
our brain is filling gaps and details and context every time we
recall the event. Remembering is an active process, not the
passive "playback" of recorded information, and that has
practical implications. Consider that, when polled, people
serving on a jury overwhelmingly indicate that eyewitness
testimony is the most compelling evidence when trying to
decide whether a defendant is guilty. But based on false
memory and other memory distortions, shouldn't jury members
be much less trusting of eyewitness testimony than they are? If
confidence is not as associated with memory accuracy as we
think, then it becomes difficult to determine whose testimony to
believe. And moreover, if memory is reconstructive, then the
mere act of recalling the event may distort the memory, further
clouding the issue.
Sequence of Events
The basic trial sequence for the encoding phase is as follows.
Instructions are presented at the beginning of the experiment.
Fixation Point
Duration determined by Fixation Point Duration
Study Stimulus
Duration determined by Study Stimulus Duration
ITI
Duration determined by ITI Durations
The basic trial sequence for the Recognition test is as follows.
Fixation Point
Duration determined by Recognition Test Fixation Point
Duration
Test Stimulus
Maximum duration determined by Maximum Allowable RT
Feedback
Feedback on response accuracy can be displayed
ITI
Duration determined by ITI Durations
Results and Output
For each participant, three tab-delimited text data files are
saved in the Logfiles folder. The .log file (filename "Subject-
Experiment Name.log") is a standard Presentation logfile and
contains detailed information about every event and response
that occurred during the experiment. The summary file
(filename: "Subject-Experiment Name-Summary.txt") contains
simple summary statistics (e.g., accuracy, RT) for relevant
experiment conditions. The remaining file contains trial-level
data. This is the file that would typically be used for running
simple analyses. A brief example of this file and description of
the column headings follows. Note that two tables are printed,
one for encoding trials and one for test trials.
Column heading list for Encoding trials:
Block
Identifies trial as Encoding
Trial Number
Trial number in the encoding block
Study Word
Study stimulus
Word Group
Word group/word list of the study stimulus
Word Number
Word number (1-15) of the study stimulus
Column heading list for Recognition trials:
Block
Identifies trial as Recognition
Trial Number
Trial number in the test block
Word Group
Word group the test stimulus belongs to
Word Number
Word number (1-15) of the test word
Test Word
Test stimulus
Word Condition
Target, Distractor, or Critical Word
Response
Participant's response (2 = "old", 3 = "new")
Accuracy
Old/new response accuracy
RT
Reaction time (in ms) for the old/new response
Configurations
Free Recall (default)
Based on the free-recall version as in Roediger and McDermott
(1995). Participants study 12 lists of 15 words each, performing
a free-recall task after studying each list.
Recognition
Based on a recognition version of the experiment as conducted
by Roediger and McDermott (1995). Participants study six lists
of 15 words, then do a recognition memory task in which the
critical word for each list is also presented.
Stimuli
Stimuli are taken from a tab-delimited text file. The text file
should contain 16 columns. Each row represents one word list,
with the first column being the "critical" word, and the
subsequent columns being the related words, listed in
descending order of relatedness.
Port Codes
The table below describes how port codes are assigned to
responses and stimulus events (if port codes are sent). In
general, responses will have port codes less than 10, and
stimulus events will have port codes 10 or higher. Note that
based on parameter settings, some of the events listed below
may not occur in the experiment.
1
Enter key
2
Left mouse button
3
Right mouse button
10
Fixation point onset
20
Study Word onset
20
Test Word onset (recognition test)
Translations
Translations are included for the following languages: English,
Spanish, German, French, Chinese, and Japanese. Use the
Language parameter to select an available translation. A
'Custom' language file (and associated stimulus files, if
necessary) is included for all experiments that can be modified
to create new translations. Some experiments contain captions
that should be translated manually as part of a parameter (for
example, a statement describing a target stimulus or position).
For this experiment, you should check the following parameters
for those captions: Correct Feedback Caption and Incorrect
Feedback Caption.
GET DATA
/TYPE=XLSX
/FILE='C:UsersstudentDownloadsVisualSearchShapes
Sum19 BothSect TriByTrixlsx.xlsx'
/SHEET=name 'VisSearShapes'
/CELLRANGE=FULL
/READNAMES=ON
/DATATYPEMIN PERCENTAGE=95.0
/HIDDEN IGNORE=YES.
EXECUTE.
DATASET NAME DataSet1 WINDOW=FRONT.
GLM SetSize1 SetSize5 SetSize15 SetSize30 BY
RMGroupSearchType
/WSFACTOR=setsize_ 4 Polynomial
/METHOD=SSTYPE(3)
/PLOT=PROFILE(setsize_*RMGroupSearchType)
TYPE=LINE ERRORBAR=CI MEANREFERENCE=NO
YAXIS=AUTO
/PRINT=DESCRIPTIVE
/CRITERIA=ALPHA(.05)
/WSDESIGN=setsize_
/DESIGN=RMGroupSearchType.
General Linear Model
Notes
Output Created
30-JUL-2019 15:18:48
Comments
Input
Active Dataset
DataSet1
Filter
<none>
Weight
<none>
Split File
<none>
N of Rows in Working Data File
3288
Missing Value Handling
Definition of Missing
User-defined missing values are treated as missing.
Cases Used
Statistics are based on all cases with valid data for all variables
in the model.
Syntax
GLM SetSize1 SetSize5 SetSize15 SetSize30 BY
RMGroupSearchType
/WSFACTOR=setsize_ 4 Polynomial
/METHOD=SSTYPE(3)
/PLOT=PROFILE(setsize_*RMGroupSearchType)
TYPE=LINE ERRORBAR=CI MEANREFERENCE=NO
YAXIS=AUTO
/PRINT=DESCRIPTIVE
/CRITERIA=ALPHA(.05)
/WSDESIGN=setsize_
/DESIGN=RMGroupSearchType.
Resources
Processor Time
00:00:01.00
Elapsed Time
00:00:01.05
[DataSet1]
Within-Subjects Factors
Measure: MEASURE_1
setsize_
Dependent Variable
1
SetSize1
2
SetSize5
3
SetSize15
4
SetSize30
Between-Subjects Factors
N
RMGroupSearchType
Conjunction
15
Feature
15
Descriptive Statistics
RMGroupSearchType
Mean
Std. Deviation
N
SetSize1
Conjunction
38246.60000000000600
7426.460540622874000
15
Feature
13742.16000000000000
3551.954884848624300
15
Total
25994.38000000000500
13711.647003825520000
30
SetSize5
Conjunction
53105.860000000010000
19204.363139542755000
15
Feature
13455.113333333335000
4366.263476256929000
15
Total
33280.486666666664000
24368.979941957776000
30
SetSize15
Conjunction
62277.999999999990000
29229.322063933378000
15
Feature
14946.806666666665000
4204.533673219671000
15
Total
38612.403333333335000
31628.366344944030000
30
SetSize30
Conjunction
73374.286666666670000
37231.610916932000000
15
Feature
15514.866666666667000
6765.410372904925000
15
Total
44444.576666666650000
39459.859318786240000
30
Multivariate Testsa
Effect
Value
F
Hypothesis df
Error df
Sig.
setsize_
Pillai's Trace
.425
6.408b
3.000
26.000
.002
Wilks' Lambda
.575
6.408b
3.000
26.000
.002
Hotelling's Trace
.739
6.408b
3.000
26.000
.002
Roy's Largest Root
.739
6.408b
3.000
26.000
.002
setsize_ * RMGroupSearchType
Pillai's Trace
.409
6.010b
3.000
26.000
.003
Wilks' Lambda
.591
6.010b
3.000
26.000
.003
Hotelling's Trace
.693
6.010b
3.000
26.000
.003
Roy's Largest Root
.693
6.010b
3.000
26.000
.003
a. Design: Intercept + RMGroupSearchType
Within Subjects Design: setsize_
b. Exact statistic
Mauchly's Test of Sphericitya
Measure: MEASURE_1
Within Subjects Effect
Mauchly's W
Approx. Chi-Square
df
Sig.
Epsilonb
Greenhouse-Geisser
Huynh-Feldt
Lower-bound
setsize_
.090
64.355
5
.000
.430
.458
.333
Tests the null hypothesis that the error covariance matrix of the
orthonormalized transformed dependent variables is
proportional to an identity matrix.
a. Design: Intercept + RMGroupSearchType
Within Subjects Design: setsize_
b. May be used to adjust the degrees of freedom for the
averaged tests of significance. Corrected tests are displayed in
the Tests of Within-Subjects Effects table.
Tests of Within-Subjects Effects
Measure: MEASURE_1
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
setsize_
Sphericity Assumed
5548440801.718
3
1849480267.239
16.733
.000
Greenhouse-Geisser
5548440801.718
1.290
4301722617.803
16.733
.000
Huynh-Feldt
5548440801.718
1.374
4038743047.853
16.733
.000
Lower-bound
5548440801.718
1.000
5548440801.718
16.733
.000
setsize_ * RMGroupSearchType
Sphericity Assumed
4433277312.162
3
1477759104.054
13.370
.000
Greenhouse-Geisser
4433277312.162
1.290
3437133055.257
13.370
.000
Huynh-Feldt
4433277312.162
1.374
3227008913.595
13.370
.000
Lower-bound
4433277312.162
1.000
4433277312.162
13.370
.001
Error(setsize_)
Sphericity Assumed
9284173594.126
84
110525876.121
Greenhouse-Geisser
9284173594.126
36.115
257073119.180
Huynh-Feldt
9284173594.126
38.467
241357327.081
Lower-bound
9284173594.126
28.000
331577628.362
Tests of Within-Subjects Contrasts
Measure: MEASURE_1
Source
setsize_
Type III Sum of Squares
df
Mean Square
F
Sig.
setsize_
Linear
5523549923.025
1
5523549923.025
19.056
.000
Quadratic
15854416.033
1
15854416.033
.836
.368
Cubic
9036462.659
1
9036462.659
.397
.534
setsize_ * RMGroupSearchType
Linear
4353400630.481
1
4353400630.481
15.019
.001
Quadratic
39987492.912
1
39987492.912
2.109
.158
Cubic
39889188.769
1
39889188.769
1.753
.196
Error(setsize_)
Linear
8116107384.227
28
289860978.008
Quadratic
530937656.310
28
18962059.154
Cubic
637128553.589
28
22754591.200
Tests of Between-Subjects Effects
Measure: MEASURE_1
Transformed Variable: Average
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
Intercept
151937659316.576
1
151937659316.576
144.945
.000
RMGroupSearchType
53771249958.075
1
53771249958.075
51.297
.000
Error
29350723695.884
28
1048240131.996
Profile Plots
GLM ConjSetSize1 ConjSetSize5 ConjSetSize15 ConjSetSize30
/WSFACTOR=setsize_2 4 Polynomial
/METHOD=SSTYPE(3)
/CRITERIA=ALPHA(.05)
/WSDESIGN=setsize_2.
General Linear Model
Notes
Output Created
30-JUL-2019 15:24:58
Comments
Input
Active Dataset
DataSet1
Filter
<none>
Weight
<none>
Split File
<none>
N of Rows in Working Data File
3288
Missing Value Handling
Definition of Missing
User-defined missing values are treated as missing.
Cases Used
Statistics are based on all cases with valid data for all variables
in the model.
Syntax
GLM ConjSetSize1 ConjSetSize5 ConjSetSize15 ConjSetSize30
/WSFACTOR=setsize_2 4 Polynomial
/METHOD=SSTYPE(3)
/CRITERIA=ALPHA(.05)
/WSDESIGN=setsize_2.
Resources
Processor Time
00:00:00.00
Elapsed Time
00:00:00.00
Within-Subjects Factors
Measure: MEASURE_1
setsize_2
Dependent Variable
1
ConjSetSize1
2
ConjSetSize5
3
ConjSetSize15
4
ConjSetSize30
Multivariate Testsa
Effect
Value
F
Hypothesis df
Error df
Sig.
setsize_2
Pillai's Trace
.593
5.831b
3.000
12.000
.011
Wilks' Lambda
.407
5.831b
3.000
12.000
.011
Hotelling's Trace
1.458
5.831b
3.000
12.000
.011
Roy's Largest Root
1.458
5.831b
3.000
12.000
.011
a. Design: Intercept
Within Subjects Design: setsize_2
b. Exact statistic
Mauchly's Test of Sphericitya
Measure: MEASURE_1
Within Subjects Effect
Mauchly's W
Approx. Chi-Square
df
Sig.
Epsilonb
Greenhouse-Geisser
Huynh-Feldt
Lower-bound
setsize_2
.062
35.303
5
.000
.413
.433
.333
Tests the null hypothesis that the error covariance matrix of the
orthonormalized transformed dependent variables is
proportional to an identity matrix.
a. Design: Intercept
Within Subjects Design: setsize_2
b. May be used to adjust the degrees of freedom for the
averaged tests of significance. Corrected tests are displayed in
the Tests of Within-Subjects Effects table.
Tests of Within-Subjects Effects
Measure: MEASURE_1
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
setsize_2
Sphericity Assumed
9938718801.636
3
3312906267.212
15.515
.000
Greenhouse-Geisser
9938718801.636
1.239
8019474544.478
15.515
.001
Huynh-Feldt
9938718801.636
1.300
7644724070.787
15.515
.000
Lower-bound
9938718801.636
1.000
9938718801.636
15.515
.001
Error(setsize_2)
Sphericity Assumed
8968192720.874
42
213528398.116
Greenhouse-Geisser
8968192720.874
17.351
516883188.082
Huynh-Feldt
8968192720.874
18.201
492729209.103
Lower-bound
8968192720.874
14.000
640585194.348
Tests of Within-Subjects Contrasts
Measure: MEASURE_1
Source
setsize_2
Type III Sum of Squares
df
Mean Square
F
Sig.
setsize_2
Linear
9842170385.280
1
9842170385.280
17.214
.001
Quadratic
53099881.153
1
53099881.153
1.788
.202
Cubic
43448535.203
1
43448535.203
1.110
.310
Error(setsize_2)
Linear
8004620197.352
14
571758585.525
Quadratic
415783540.857
14
29698824.347
Cubic
547788982.665
14
39127784.476
Tests of Between-Subjects Effects
Measure: MEASURE_1
Transformed Variable: Average
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
Intercept
193241831284.491
1
193241831284.491
95.479
.000
Error
28334891272.739
14
2023920805.196
GLM FeatSetSize1 FeatSetSize5 FeatSetSize15 FeatSetSize30
/WSFACTOR=feature 4 Polynomial
/METHOD=SSTYPE(3)
/CRITERIA=ALPHA(.05)
/WSDESIGN=feature.
General Linear Model
Notes
Output Created
30-JUL-2019 15:29:37
Comments
Input
Active Dataset
DataSet1
Filter
<none>
Weight
<none>
Split File
<none>
N of Rows in Working Data File
3288
Missing Value Handling
Definition of Missing
User-defined missing values are treated as missing.
Cases Used
Statistics are based on all cases with valid data for all variables
in the model.
Syntax
GLM FeatSetSize1 FeatSetSize5 FeatSetSize15 FeatSetSize30
/WSFACTOR=feature 4 Polynomial
/METHOD=SSTYPE(3)
/CRITERIA=ALPHA(.05)
/WSDESIGN=feature.
Resources
Processor Time
00:00:00.00
Elapsed Time
00:00:00.00
Within-Subjects Factors
Measure: MEASURE_1
feature
Dependent Variable
1
FeatSetSize1
2
FeatSetSize5
3
FeatSetSize15
4
FeatSetSize30
Multivariate Testsa
Effect
Value
F
Hypothesis df
Error df
Sig.
feature
Pillai's Trace
.478
3.657b
3.000
12.000
.044
Wilks' Lambda
.522
3.657b
3.000
12.000
.044
Hotelling's Trace
.914
3.657b
3.000
12.000
.044
Roy's Largest Root
.914
3.657b
3.000
12.000
.044
a. Design: Intercept
Within Subjects Design: feature
b. Exact statistic
Mauchly's Test of Sphericitya
Measure: MEASURE_1
Within Subjects Effect
Mauchly's W
Approx. Chi-Square
df
Sig.
Epsilonb
Greenhouse-Geisser
Huynh-Feldt
Lower-bound
feature
.339
13.775
5
.017
.670
.783
.333
Tests the null hypothesis that the error covariance matrix of the
orthonormalized transformed dependent variables is
proportional to an identity matrix.
a. Design: Intercept
Within Subjects Design: feature
b. May be used to adjust the degrees of freedom for the
averaged tests of significance. Corrected tests are displayed in
the Tests of Within-Subjects Effects table.
Tests of Within-Subjects Effects
Measure: MEASURE_1
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
feature
Sphericity Assumed
42999312.243
3
14333104.081
1.905
.143
Greenhouse-Geisser
42999312.243
2.011
21382901.895
1.905
.167
Huynh-Feldt
42999312.243
2.349
18304422.273
1.905
.159
Lower-bound
42999312.243
1.000
42999312.243
1.905
.189
Error(feature)
Sphericity Assumed
315980873.252
42
7523354.125
Greenhouse-Geisser
315980873.252
28.153
11223747.645
Huynh-Feldt
315980873.252
32.888
9607873.496
Lower-bound
315980873.252
14.000
22570062.375
Tests of Within-Subjects Contrasts
Measure: MEASURE_1
Source
feature
Type III Sum of Squares
df
Mean Square
F
Sig.
feature
Linear
34780168.226
1
34780168.226
4.368
.055
Quadratic
2742027.793
1
2742027.793
.333
.573
Cubic
5477116.225
1
5477116.225
.858
.370
Error(feature)
Linear
111487186.875
14
7963370.491
Quadratic
115154115.452
14
8225293.961
Cubic
89339570.924
14
6381397.923
Tests of Between-Subjects Effects
Measure: MEASURE_1
Transformed Variable: Average
Source
Type III Sum of Squares
df
Mean Square
F
Sig.
Intercept
12467077990.161
1
12467077990.161
171.819
.000
Error
1015832423.144
14
72559458.796
T-TEST PAIRS=ConjSetSize15 ConjSetSize1 ConjSetSize1
ConjSetSize5 ConjSetSize5 ConjSetSize15 WITH
ConjSetSize5 ConjSetSize15 ConjSetSize30 ConjSetSize15
ConjSetSize30 ConjSetSize30 (PAIRED)
/CRITERIA=CI(.9500)
/MISSING=ANALYSIS.
T-Test
Notes
Output Created
30-JUL-2019 15:39:19
Comments
Input
Active Dataset
DataSet1
Filter
<none>
Weight
<none>
Split File
<none>
N of Rows in Working Data File
3288
Missing Value Handling
Definition of Missing
User defined missing values are treated as missing.
Cases Used
Statistics for each analysis are based on the cases with no
missing or out-of-range data for any variable in the analysis.
Syntax
T-TEST PAIRS=ConjSetSize15 ConjSetSize1 ConjSetSize1
ConjSetSize5 ConjSetSize5 ConjSetSize15 WITH
ConjSetSize5 ConjSetSize15 ConjSetSize30 ConjSetSize15
ConjSetSize30 ConjSetSize30 (PAIRED)
/CRITERIA=CI(.9500)
/MISSING=ANALYSIS.
Resources
Processor Time
00:00:00.02
Elapsed Time
00:00:00.02
Paired Samples Statistics
Mean
N
Std. Deviation
Std. Error Mean
Pair 1
ConjSetSize15
62277.99999999999000
15
29229.322063933378000
7546.978504969798000
ConjSetSize5
53105.86000000000000
15
19204.363139542755000
4958.545240931245000
Pair 2
ConjSetSize1
38246.60000000000000
15
7426.460540622874000
1917.503866339928000
ConjSetSize15
62277.99999999999000
15
29229.322063933378000
7546.978504969798000
Pair 3
ConjSetSize1
38246.60000000000000
15
7426.460540622874000
1917.503866339928000
ConjSetSize30
73374.28666666667000
15
37231.610916932000000
9613.160602250126000
Pair 4
ConjSetSize5
53105.86000000000000
15
19204.363139542755000
4958.545240931245000
ConjSetSize15
62277.99999999999000
15
29229.322063933378000
7546.978504969798000
Pair 5
ConjSetSize5
53105.86000000000000
15
19204.363139542755000
4958.545240931245000
ConjSetSize30
73374.28666666667000
15
37231.610916932000000
9613.160602250126000
Pair 6
ConjSetSize15
62277.99999999999000
15
29229.322063933378000
7546.978504969798000
ConjSetSize30
73374.28666666667000
15
37231.610916932000000
9613.160602250126000
Paired Samples Correlations
N
Correlation
Sig.
Pair 1
ConjSetSize15 & ConjSetSize5
15
.900
.000
Pair 2
ConjSetSize1 & ConjSetSize15
15
.854
.000
Pair 3
ConjSetSize1 & ConjSetSize30
15
.783
.001
Pair 4
ConjSetSize5 & ConjSetSize15
15
.900
.000
Pair 5
ConjSetSize5 & ConjSetSize30
15
.885
.000
Pair 6
ConjSetSize15 & ConjSetSize30
15
.970
.000
Paired Samples Test
Paired Differences
t
df
Sig. (2-tailed)
Mean
Std. Deviation
Std. Error Mean
95% Confidence Interval of the Difference
Lower
Upper
Pair 1
ConjSetSize15 - ConjSetSize5
9172.139999999992000
14601.209434681383000
3770.016065000507300
1086.259730550694300
17258.020269449290000
2.433
14
.029
Pair 2
ConjSetSize1 - ConjSetSize15
-24031.399999999994000
23206.989557058634000
5992.018938006502000
-36883.002451987630000
-11179.797548012355000
-4.011
14
.001
Pair 3
ConjSetSize1 - ConjSetSize30
-35127.686666666670000
31758.107989093944000
8199.908223254504000
-52714.740666050550000
-17540.632667282790000
-4.284
14
.001
Pair 4
ConjSetSize5 - ConjSetSize15
-9172.139999999992000
14601.209434681383000
3770.016065000507300
-17258.020269449290000
-1086.259730550694300
-2.433
14
.029
Pair 5
ConjSetSize5 - ConjSetSize30
-20268.426666666666000
22117.479936643096000
5710.708763646358000
-32516.678801510840000
-8020.174531822495000
-3.549
14
.003
Pair 6
ConjSetSize15 - ConjSetSize30
-11096.286666666674000
11382.030398010638000
2938.827611834785300
-17399.445006615150000
-4793.128326718196000
-3.776
14
.002
Visual Search (Shapes)
Teaching Information
| Background | Results | Suggestions | References |
Background
How do we find what we're looking for and ignore distracting
information? The visual search task requires participants to
determine whether a target (such as a particular letter, shape, or
image) is present in an array of other stimuli. For example, a
participant might be asked to determine whether a red letter is
present in the following display:
Two major findings came out of early visual search studies
(e.g., Treisman & Gelade, 1980). First, finding the target is
sometimes so easy that the target is said to "pop out" from the
array. Searches in which at least one feature always
differentiates targets from distractors (in the above example,
color) are called feature searches. In feature searches, the time
to find the target is not affected by the number of irrelevant
distractor stimuli: people are just as fast to spot the red letter
whether there's one blue letter or a dozen.
In conjunction searches, participants must consider at least two
features. For example, a conjunction search would be finding a
red X in an array of blue X's and red T's, meaning that the
conjunction of two features (shape and color) is required to
isolate the target. In conjunction searches, the number of
distractors matter: search times increase linearly with the
number of distractors. Thus, whereas feature searches are fast,
parallel, and independent of distractor stimuli, conjunction
searches are slow, serial, and depend on the number of
distractors.
The feature integration theory is often used to explain these
results (Treisman & Gelade, 1980). According to feature
integration theory, the features or characteristics (e.g., shape,
color, etc.) of objects we see are coded independently (but in
parallel) early in visual processing. For example, at the earliest
stages of processing a red X, independent, unconnected features
are being activated for "red" and for "X". Only later are those
features "integrated" into a unified "red x" representation. In a
feature search, features don't need to be integrated to complete
the search, so the search is rapid. Conjunction searches are
slower because that integration has to happen in order to
distinguish targets from distractors.
**Added by Craig** Article on the STM capacity for feature
and conjunction searches (Luck & Vogel, 1997). And another
frequently cited article (Wolfe, 1994).
Results
For the standard experiment, the dependent variable will usually
be reaction time. The most likely independent variables will be
the number of items in the study set, and the type of search
(feature or conjunction). Based on past results (e.g., Treisman &
Gelade, 1980), for feature searches, the search time is
independent of set size. In contrast, for conjunction searches,
reaction time should increase with set size. A repeated-measures
ANOVA with search type (feature vs. conjunction) and set size
as independent variables would be appropriate.
Suggestions
1. Change the number of targets. Are feature searches always
independent of set size, even when the number of possible
targets is high?
2. How do search times change when target colors or target
letter shapes are very similar (or dissimilar) to the distractors.
References
Treisman, A., & Gelade, G. (1980). A feature integration theory
of attention. Cognitive Psychology, 12, 97-136.
Luck, S. J., & Vogel, E. K. (1997). The capacity of visual
working memory for features and conjunctions. Nature,
390(6657), 279–281. https://doi.org/10.1038/36846
Wolfe, J. M. (1994). Guided search 2.0: A revised model of
visual search. Psychonomic Bulletin & Review, 1(2), 202–238.
https://doi.org/10.3758/BF03200774
Grading Rubric for PY-356 Research Proposal
Name: _______________________
Point Value
(total) ________
________
________
________
________
1. Introduction (5 points each, 20 points total)
a. Purpose/Importance of the study is clearly explained
b. Prior related research is clearly summarized and connected
c. Concludes with a clearly stated research Hypothesis
d. Includes citations from at least 5 peer-reviewed journal
articles
e. Proper APA style formatting (style, grammar, organization)
in
title page, body of introduction, and in-text citations. ________
Qualitative Feedback:
Good things:
Areas for improvement:
(total) ________
________
________
________
________
2. Method (10 points)
a. Independent variables are conceptually and operationally
defined
b. Adequate/Clear description of participants (i.e., selection,
censoring,
characteristics)
c. Adequate/Clear description of research design
d. Adequate/Clear description of experimental procedure
e. Proper APA style formatting
Qualitative Feedback:
Good things:
Areas for improvement:
Grading Rubric for PY-356 Research Proposal
________
Introduction Paper Rubric Paper Rubric_Methods
Student Name: good things: areas for improvement: 2
Dropdown: [4]3 Dropdown: [4]4 Dropdown: [4]5 Dropdown:
[4]6 Dropdown: [4]7 Dropdown: [1]Good_Things:
Areas_For_Improvement: 8 Dropdown: [2]9 Dropdown: [2]10
Dropdown: [2]11 Dropdown: [2]12 Dropdown: [2]1 Dropdown:
[20]

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  • 1. False Memory Background It's a common intuition that memory is like a video camera: we store a copy of whatever we were experiencing, and later we remember by playing it back. Among the many reasons this view of memory is incorrect is that it assumes our memory is always, or at least very often, accurate. But in fact, not only is memory inaccurate, it's often less accurate than we think: we might be very confident in a memory only to realize it was totally wrong. One way memory can be distorted is through misinformation. Loftus and Palmer (1974) showed participants a video clip of a car accident, then asked them to estimate the speed of one car in the video. However, one group of participants was asked how fast the car was going when it "smashed into" the other car, while the second group was asked how fast the car was going when it "hit" the other car. Participants who were asked the "smashed" question estimated much higher speeds than those asked the "hit" question, even though both groups of participants saw the same video--suggesting that memories can be distorted by how questions about the memory are framed. Worse still, we can be poor judges of our own memory accuracy: in one study of vivid, emotional flashbulb memories, confidence in the memories was extremely high, but those high- confidence memories were not any more accurate than typical memories (Talarico & Rubin, 2003). We can also experience entirely false memories. In the Deese- Roediger-McDermott paradigm (Deese, 1959; Roediger & McDermott, 1995), participants see lists of words that are all related to a single "critical" word. For example, if the critical word was candy, participants might see words like sweet, chocolate, or bar. The important part of the paradigm is that the critical word ("candy") is never presented to participants. Despite this, when asked to recall words later, many
  • 2. participants will falsely remember seeing the critical word, and most will be confident that their recollection is accurate. Mostly, these misinformation and false memory effects happen because remembering is reconstructive. We don't just press "play" on a video recording of the event; when we remember our brain is filling gaps and details and context every time we recall the event. Remembering is an active process, not the passive "playback" of recorded information, and that has practical implications. Consider that, when polled, people serving on a jury overwhelmingly indicate that eyewitness testimony is the most compelling evidence when trying to decide whether a defendant is guilty. But based on false memory and other memory distortions, shouldn't jury members be much less trusting of eyewitness testimony than they are? If confidence is not as associated with memory accuracy as we think, then it becomes difficult to determine whose testimony to believe. And moreover, if memory is reconstructive, then the mere act of recalling the event may distort the memory, further clouding the issue. Sequence of Events The basic trial sequence for the encoding phase is as follows. Instructions are presented at the beginning of the experiment. Fixation Point Duration determined by Fixation Point Duration Study Stimulus Duration determined by Study Stimulus Duration ITI Duration determined by ITI Durations The basic trial sequence for the Recognition test is as follows. Fixation Point Duration determined by Recognition Test Fixation Point Duration
  • 3. Test Stimulus Maximum duration determined by Maximum Allowable RT Feedback Feedback on response accuracy can be displayed ITI Duration determined by ITI Durations Results and Output For each participant, three tab-delimited text data files are saved in the Logfiles folder. The .log file (filename "Subject- Experiment Name.log") is a standard Presentation logfile and contains detailed information about every event and response that occurred during the experiment. The summary file (filename: "Subject-Experiment Name-Summary.txt") contains simple summary statistics (e.g., accuracy, RT) for relevant experiment conditions. The remaining file contains trial-level data. This is the file that would typically be used for running simple analyses. A brief example of this file and description of the column headings follows. Note that two tables are printed, one for encoding trials and one for test trials. Column heading list for Encoding trials: Block Identifies trial as Encoding Trial Number Trial number in the encoding block Study Word Study stimulus Word Group Word group/word list of the study stimulus Word Number Word number (1-15) of the study stimulus Column heading list for Recognition trials: Block Identifies trial as Recognition Trial Number
  • 4. Trial number in the test block Word Group Word group the test stimulus belongs to Word Number Word number (1-15) of the test word Test Word Test stimulus Word Condition Target, Distractor, or Critical Word Response Participant's response (2 = "old", 3 = "new") Accuracy Old/new response accuracy RT Reaction time (in ms) for the old/new response Configurations Free Recall (default) Based on the free-recall version as in Roediger and McDermott (1995). Participants study 12 lists of 15 words each, performing a free-recall task after studying each list. Recognition Based on a recognition version of the experiment as conducted by Roediger and McDermott (1995). Participants study six lists of 15 words, then do a recognition memory task in which the critical word for each list is also presented. Stimuli Stimuli are taken from a tab-delimited text file. The text file should contain 16 columns. Each row represents one word list, with the first column being the "critical" word, and the subsequent columns being the related words, listed in descending order of relatedness. Port Codes The table below describes how port codes are assigned to responses and stimulus events (if port codes are sent). In general, responses will have port codes less than 10, and stimulus events will have port codes 10 or higher. Note that
  • 5. based on parameter settings, some of the events listed below may not occur in the experiment. 1 Enter key 2 Left mouse button 3 Right mouse button 10 Fixation point onset 20 Study Word onset 20 Test Word onset (recognition test) Translations Translations are included for the following languages: English, Spanish, German, French, Chinese, and Japanese. Use the Language parameter to select an available translation. A 'Custom' language file (and associated stimulus files, if necessary) is included for all experiments that can be modified to create new translations. Some experiments contain captions that should be translated manually as part of a parameter (for example, a statement describing a target stimulus or position). For this experiment, you should check the following parameters for those captions: Correct Feedback Caption and Incorrect Feedback Caption. False Memory Background It's a common intuition that memory is like a video camera: we store a copy of whatever we were experiencing, and later we remember by playing it back. Among the many reasons this view of memory is incorrect is that it assumes our memory is always, or at least very often, accurate. But in fact, not only is memory inaccurate, it's often less accurate than we think: we
  • 6. might be very confident in a memory only to realize it was totally wrong. One way memory can be distorted is through misinformation. Loftus and Palmer (1974) showed participants a video clip of a car accident, then asked them to estimate the speed of one car in the video. However, one group of participants was asked how fast the car was going when it "smashed into" the other car, while the second group was asked how fast the car was going when it "hit" the other car. Participants who were asked the "smashed" question estimated much higher speeds than those asked the "hit" question, even though both groups of participants saw the same video--suggesting that memories can be distorted by how questions about the memory are framed. Worse still, we can be poor judges of our own memory accuracy: in one study of vivid, emotional flashbulb memories, confidence in the memories was extremely high, but those high- confidence memories were not any more accurate than typical memories (Talarico & Rubin, 2003). We can also experience entirely false memories. In the Deese- Roediger-McDermott paradigm (Deese, 1959; Roediger & McDermott, 1995), participants see lists of words that are all related to a single "critical" word. For example, if the critical word was candy, participants might see words like sweet, chocolate, or bar. The important part of the paradigm is that the critical word ("candy") is never presented to participants. Despite this, when asked to recall words later, many participants will falsely remember seeing the critical word, and most will be confident that their recollection is accurate. Mostly, these misinformation and false memory effects happen because remembering is reconstructive. We don't just press "play" on a video recording of the event; when we remember our brain is filling gaps and details and context every time we recall the event. Remembering is an active process, not the passive "playback" of recorded information, and that has practical implications. Consider that, when polled, people serving on a jury overwhelmingly indicate that eyewitness
  • 7. testimony is the most compelling evidence when trying to decide whether a defendant is guilty. But based on false memory and other memory distortions, shouldn't jury members be much less trusting of eyewitness testimony than they are? If confidence is not as associated with memory accuracy as we think, then it becomes difficult to determine whose testimony to believe. And moreover, if memory is reconstructive, then the mere act of recalling the event may distort the memory, further clouding the issue. Sequence of Events The basic trial sequence for the encoding phase is as follows. Instructions are presented at the beginning of the experiment. Fixation Point Duration determined by Fixation Point Duration Study Stimulus Duration determined by Study Stimulus Duration ITI Duration determined by ITI Durations The basic trial sequence for the Recognition test is as follows. Fixation Point Duration determined by Recognition Test Fixation Point Duration Test Stimulus Maximum duration determined by Maximum Allowable RT Feedback Feedback on response accuracy can be displayed ITI Duration determined by ITI Durations Results and Output For each participant, three tab-delimited text data files are saved in the Logfiles folder. The .log file (filename "Subject- Experiment Name.log") is a standard Presentation logfile and
  • 8. contains detailed information about every event and response that occurred during the experiment. The summary file (filename: "Subject-Experiment Name-Summary.txt") contains simple summary statistics (e.g., accuracy, RT) for relevant experiment conditions. The remaining file contains trial-level data. This is the file that would typically be used for running simple analyses. A brief example of this file and description of the column headings follows. Note that two tables are printed, one for encoding trials and one for test trials. Column heading list for Encoding trials: Block Identifies trial as Encoding Trial Number Trial number in the encoding block Study Word Study stimulus Word Group Word group/word list of the study stimulus Word Number Word number (1-15) of the study stimulus Column heading list for Recognition trials: Block Identifies trial as Recognition Trial Number Trial number in the test block Word Group Word group the test stimulus belongs to Word Number Word number (1-15) of the test word Test Word Test stimulus Word Condition Target, Distractor, or Critical Word Response
  • 9. Participant's response (2 = "old", 3 = "new") Accuracy Old/new response accuracy RT Reaction time (in ms) for the old/new response Configurations Free Recall (default) Based on the free-recall version as in Roediger and McDermott (1995). Participants study 12 lists of 15 words each, performing a free-recall task after studying each list. Recognition Based on a recognition version of the experiment as conducted by Roediger and McDermott (1995). Participants study six lists of 15 words, then do a recognition memory task in which the critical word for each list is also presented. Stimuli Stimuli are taken from a tab-delimited text file. The text file should contain 16 columns. Each row represents one word list, with the first column being the "critical" word, and the subsequent columns being the related words, listed in descending order of relatedness. Port Codes The table below describes how port codes are assigned to responses and stimulus events (if port codes are sent). In general, responses will have port codes less than 10, and stimulus events will have port codes 10 or higher. Note that based on parameter settings, some of the events listed below may not occur in the experiment. 1 Enter key 2 Left mouse button 3 Right mouse button 10 Fixation point onset
  • 10. 20 Study Word onset 20 Test Word onset (recognition test) Translations Translations are included for the following languages: English, Spanish, German, French, Chinese, and Japanese. Use the Language parameter to select an available translation. A 'Custom' language file (and associated stimulus files, if necessary) is included for all experiments that can be modified to create new translations. Some experiments contain captions that should be translated manually as part of a parameter (for example, a statement describing a target stimulus or position). For this experiment, you should check the following parameters for those captions: Correct Feedback Caption and Incorrect Feedback Caption. GET DATA /TYPE=XLSX /FILE='C:UsersstudentDownloadsVisualSearchShapes Sum19 BothSect TriByTrixlsx.xlsx' /SHEET=name 'VisSearShapes' /CELLRANGE=FULL /READNAMES=ON /DATATYPEMIN PERCENTAGE=95.0 /HIDDEN IGNORE=YES. EXECUTE. DATASET NAME DataSet1 WINDOW=FRONT. GLM SetSize1 SetSize5 SetSize15 SetSize30 BY RMGroupSearchType /WSFACTOR=setsize_ 4 Polynomial /METHOD=SSTYPE(3) /PLOT=PROFILE(setsize_*RMGroupSearchType)
  • 11. TYPE=LINE ERRORBAR=CI MEANREFERENCE=NO YAXIS=AUTO /PRINT=DESCRIPTIVE /CRITERIA=ALPHA(.05) /WSDESIGN=setsize_ /DESIGN=RMGroupSearchType. General Linear Model Notes Output Created 30-JUL-2019 15:18:48 Comments Input Active Dataset DataSet1 Filter <none> Weight <none> Split File <none> N of Rows in Working Data File 3288 Missing Value Handling Definition of Missing User-defined missing values are treated as missing.
  • 12. Cases Used Statistics are based on all cases with valid data for all variables in the model. Syntax GLM SetSize1 SetSize5 SetSize15 SetSize30 BY RMGroupSearchType /WSFACTOR=setsize_ 4 Polynomial /METHOD=SSTYPE(3) /PLOT=PROFILE(setsize_*RMGroupSearchType) TYPE=LINE ERRORBAR=CI MEANREFERENCE=NO YAXIS=AUTO /PRINT=DESCRIPTIVE /CRITERIA=ALPHA(.05) /WSDESIGN=setsize_ /DESIGN=RMGroupSearchType. Resources Processor Time 00:00:01.00 Elapsed Time 00:00:01.05 [DataSet1] Within-Subjects Factors Measure: MEASURE_1 setsize_ Dependent Variable 1 SetSize1 2 SetSize5
  • 13. 3 SetSize15 4 SetSize30 Between-Subjects Factors N RMGroupSearchType Conjunction 15 Feature 15 Descriptive Statistics RMGroupSearchType Mean Std. Deviation N SetSize1 Conjunction 38246.60000000000600 7426.460540622874000 15 Feature 13742.16000000000000 3551.954884848624300 15 Total 25994.38000000000500
  • 15. 15 Feature 15514.866666666667000 6765.410372904925000 15 Total 44444.576666666650000 39459.859318786240000 30 Multivariate Testsa Effect Value F Hypothesis df Error df Sig. setsize_ Pillai's Trace .425 6.408b 3.000 26.000 .002 Wilks' Lambda .575 6.408b 3.000 26.000 .002 Hotelling's Trace
  • 16. .739 6.408b 3.000 26.000 .002 Roy's Largest Root .739 6.408b 3.000 26.000 .002 setsize_ * RMGroupSearchType Pillai's Trace .409 6.010b 3.000 26.000 .003 Wilks' Lambda .591 6.010b 3.000 26.000 .003 Hotelling's Trace .693 6.010b 3.000 26.000 .003 Roy's Largest Root .693
  • 17. 6.010b 3.000 26.000 .003 a. Design: Intercept + RMGroupSearchType Within Subjects Design: setsize_ b. Exact statistic Mauchly's Test of Sphericitya Measure: MEASURE_1 Within Subjects Effect Mauchly's W Approx. Chi-Square df Sig. Epsilonb Greenhouse-Geisser Huynh-Feldt Lower-bound setsize_ .090 64.355 5 .000 .430 .458 .333 Tests the null hypothesis that the error covariance matrix of the orthonormalized transformed dependent variables is proportional to an identity matrix.
  • 18. a. Design: Intercept + RMGroupSearchType Within Subjects Design: setsize_ b. May be used to adjust the degrees of freedom for the averaged tests of significance. Corrected tests are displayed in the Tests of Within-Subjects Effects table. Tests of Within-Subjects Effects Measure: MEASURE_1 Source Type III Sum of Squares df Mean Square F Sig. setsize_ Sphericity Assumed 5548440801.718 3 1849480267.239 16.733 .000 Greenhouse-Geisser 5548440801.718 1.290 4301722617.803 16.733 .000 Huynh-Feldt 5548440801.718 1.374 4038743047.853 16.733 .000
  • 19. Lower-bound 5548440801.718 1.000 5548440801.718 16.733 .000 setsize_ * RMGroupSearchType Sphericity Assumed 4433277312.162 3 1477759104.054 13.370 .000 Greenhouse-Geisser 4433277312.162 1.290 3437133055.257 13.370 .000 Huynh-Feldt 4433277312.162 1.374 3227008913.595 13.370 .000 Lower-bound 4433277312.162 1.000 4433277312.162 13.370 .001 Error(setsize_)
  • 23. df Mean Square F Sig. Intercept 151937659316.576 1 151937659316.576 144.945 .000 RMGroupSearchType 53771249958.075 1 53771249958.075 51.297 .000 Error 29350723695.884 28 1048240131.996 Profile Plots GLM ConjSetSize1 ConjSetSize5 ConjSetSize15 ConjSetSize30 /WSFACTOR=setsize_2 4 Polynomial /METHOD=SSTYPE(3) /CRITERIA=ALPHA(.05) /WSDESIGN=setsize_2.
  • 24. General Linear Model Notes Output Created 30-JUL-2019 15:24:58 Comments Input Active Dataset DataSet1 Filter <none> Weight <none> Split File <none> N of Rows in Working Data File 3288 Missing Value Handling Definition of Missing User-defined missing values are treated as missing. Cases Used Statistics are based on all cases with valid data for all variables in the model. Syntax GLM ConjSetSize1 ConjSetSize5 ConjSetSize15 ConjSetSize30
  • 25. /WSFACTOR=setsize_2 4 Polynomial /METHOD=SSTYPE(3) /CRITERIA=ALPHA(.05) /WSDESIGN=setsize_2. Resources Processor Time 00:00:00.00 Elapsed Time 00:00:00.00 Within-Subjects Factors Measure: MEASURE_1 setsize_2 Dependent Variable 1 ConjSetSize1 2 ConjSetSize5 3 ConjSetSize15 4 ConjSetSize30 Multivariate Testsa Effect Value F Hypothesis df Error df Sig. setsize_2 Pillai's Trace .593
  • 26. 5.831b 3.000 12.000 .011 Wilks' Lambda .407 5.831b 3.000 12.000 .011 Hotelling's Trace 1.458 5.831b 3.000 12.000 .011 Roy's Largest Root 1.458 5.831b 3.000 12.000 .011 a. Design: Intercept Within Subjects Design: setsize_2 b. Exact statistic Mauchly's Test of Sphericitya Measure: MEASURE_1 Within Subjects Effect Mauchly's W Approx. Chi-Square df
  • 27. Sig. Epsilonb Greenhouse-Geisser Huynh-Feldt Lower-bound setsize_2 .062 35.303 5 .000 .413 .433 .333 Tests the null hypothesis that the error covariance matrix of the orthonormalized transformed dependent variables is proportional to an identity matrix. a. Design: Intercept Within Subjects Design: setsize_2 b. May be used to adjust the degrees of freedom for the averaged tests of significance. Corrected tests are displayed in the Tests of Within-Subjects Effects table. Tests of Within-Subjects Effects Measure: MEASURE_1 Source Type III Sum of Squares df Mean Square F Sig.
  • 29. Greenhouse-Geisser 8968192720.874 17.351 516883188.082 Huynh-Feldt 8968192720.874 18.201 492729209.103 Lower-bound 8968192720.874 14.000 640585194.348 Tests of Within-Subjects Contrasts Measure: MEASURE_1 Source setsize_2 Type III Sum of Squares df Mean Square F Sig. setsize_2 Linear 9842170385.280 1 9842170385.280
  • 31. Tests of Between-Subjects Effects Measure: MEASURE_1 Transformed Variable: Average Source Type III Sum of Squares df Mean Square F Sig. Intercept 193241831284.491 1 193241831284.491 95.479 .000 Error 28334891272.739 14 2023920805.196 GLM FeatSetSize1 FeatSetSize5 FeatSetSize15 FeatSetSize30 /WSFACTOR=feature 4 Polynomial /METHOD=SSTYPE(3) /CRITERIA=ALPHA(.05) /WSDESIGN=feature. General Linear Model
  • 32. Notes Output Created 30-JUL-2019 15:29:37 Comments Input Active Dataset DataSet1 Filter <none> Weight <none> Split File <none> N of Rows in Working Data File 3288 Missing Value Handling Definition of Missing User-defined missing values are treated as missing. Cases Used Statistics are based on all cases with valid data for all variables in the model. Syntax GLM FeatSetSize1 FeatSetSize5 FeatSetSize15 FeatSetSize30 /WSFACTOR=feature 4 Polynomial /METHOD=SSTYPE(3) /CRITERIA=ALPHA(.05) /WSDESIGN=feature. Resources
  • 33. Processor Time 00:00:00.00 Elapsed Time 00:00:00.00 Within-Subjects Factors Measure: MEASURE_1 feature Dependent Variable 1 FeatSetSize1 2 FeatSetSize5 3 FeatSetSize15 4 FeatSetSize30 Multivariate Testsa Effect Value F Hypothesis df Error df Sig. feature Pillai's Trace .478 3.657b 3.000 12.000 .044
  • 34. Wilks' Lambda .522 3.657b 3.000 12.000 .044 Hotelling's Trace .914 3.657b 3.000 12.000 .044 Roy's Largest Root .914 3.657b 3.000 12.000 .044 a. Design: Intercept Within Subjects Design: feature b. Exact statistic Mauchly's Test of Sphericitya Measure: MEASURE_1 Within Subjects Effect Mauchly's W Approx. Chi-Square df Sig. Epsilonb
  • 35. Greenhouse-Geisser Huynh-Feldt Lower-bound feature .339 13.775 5 .017 .670 .783 .333 Tests the null hypothesis that the error covariance matrix of the orthonormalized transformed dependent variables is proportional to an identity matrix. a. Design: Intercept Within Subjects Design: feature b. May be used to adjust the degrees of freedom for the averaged tests of significance. Corrected tests are displayed in the Tests of Within-Subjects Effects table. Tests of Within-Subjects Effects Measure: MEASURE_1 Source Type III Sum of Squares df Mean Square F Sig. feature Sphericity Assumed 42999312.243 3 14333104.081
  • 37. Huynh-Feldt 315980873.252 32.888 9607873.496 Lower-bound 315980873.252 14.000 22570062.375 Tests of Within-Subjects Contrasts Measure: MEASURE_1 Source feature Type III Sum of Squares df Mean Square F Sig. feature Linear 34780168.226 1 34780168.226 4.368 .055 Quadratic 2742027.793
  • 39. Transformed Variable: Average Source Type III Sum of Squares df Mean Square F Sig. Intercept 12467077990.161 1 12467077990.161 171.819 .000 Error 1015832423.144 14 72559458.796 T-TEST PAIRS=ConjSetSize15 ConjSetSize1 ConjSetSize1 ConjSetSize5 ConjSetSize5 ConjSetSize15 WITH ConjSetSize5 ConjSetSize15 ConjSetSize30 ConjSetSize15 ConjSetSize30 ConjSetSize30 (PAIRED) /CRITERIA=CI(.9500) /MISSING=ANALYSIS. T-Test Notes Output Created
  • 40. 30-JUL-2019 15:39:19 Comments Input Active Dataset DataSet1 Filter <none> Weight <none> Split File <none> N of Rows in Working Data File 3288 Missing Value Handling Definition of Missing User defined missing values are treated as missing. Cases Used Statistics for each analysis are based on the cases with no missing or out-of-range data for any variable in the analysis. Syntax T-TEST PAIRS=ConjSetSize15 ConjSetSize1 ConjSetSize1 ConjSetSize5 ConjSetSize5 ConjSetSize15 WITH ConjSetSize5 ConjSetSize15 ConjSetSize30 ConjSetSize15 ConjSetSize30 ConjSetSize30 (PAIRED) /CRITERIA=CI(.9500) /MISSING=ANALYSIS. Resources Processor Time 00:00:00.02
  • 41. Elapsed Time 00:00:00.02 Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 ConjSetSize15 62277.99999999999000 15 29229.322063933378000 7546.978504969798000 ConjSetSize5 53105.86000000000000 15 19204.363139542755000 4958.545240931245000 Pair 2 ConjSetSize1 38246.60000000000000 15 7426.460540622874000 1917.503866339928000 ConjSetSize15 62277.99999999999000 15 29229.322063933378000 7546.978504969798000 Pair 3 ConjSetSize1
  • 43. 62277.99999999999000 15 29229.322063933378000 7546.978504969798000 ConjSetSize30 73374.28666666667000 15 37231.610916932000000 9613.160602250126000 Paired Samples Correlations N Correlation Sig. Pair 1 ConjSetSize15 & ConjSetSize5 15 .900 .000 Pair 2 ConjSetSize1 & ConjSetSize15 15 .854 .000 Pair 3 ConjSetSize1 & ConjSetSize30 15 .783 .001 Pair 4 ConjSetSize5 & ConjSetSize15 15 .900
  • 44. .000 Pair 5 ConjSetSize5 & ConjSetSize30 15 .885 .000 Pair 6 ConjSetSize15 & ConjSetSize30 15 .970 .000 Paired Samples Test Paired Differences t df Sig. (2-tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper
  • 45. Pair 1 ConjSetSize15 - ConjSetSize5 9172.139999999992000 14601.209434681383000 3770.016065000507300 1086.259730550694300 17258.020269449290000 2.433 14 .029 Pair 2 ConjSetSize1 - ConjSetSize15 -24031.399999999994000 23206.989557058634000 5992.018938006502000 -36883.002451987630000 -11179.797548012355000 -4.011 14 .001 Pair 3 ConjSetSize1 - ConjSetSize30 -35127.686666666670000 31758.107989093944000 8199.908223254504000 -52714.740666050550000 -17540.632667282790000 -4.284 14 .001 Pair 4 ConjSetSize5 - ConjSetSize15 -9172.139999999992000 14601.209434681383000 3770.016065000507300 -17258.020269449290000
  • 46. -1086.259730550694300 -2.433 14 .029 Pair 5 ConjSetSize5 - ConjSetSize30 -20268.426666666666000 22117.479936643096000 5710.708763646358000 -32516.678801510840000 -8020.174531822495000 -3.549 14 .003 Pair 6 ConjSetSize15 - ConjSetSize30 -11096.286666666674000 11382.030398010638000 2938.827611834785300 -17399.445006615150000 -4793.128326718196000 -3.776 14 .002 Visual Search (Shapes) Teaching Information | Background | Results | Suggestions | References | Background How do we find what we're looking for and ignore distracting information? The visual search task requires participants to determine whether a target (such as a particular letter, shape, or image) is present in an array of other stimuli. For example, a participant might be asked to determine whether a red letter is
  • 47. present in the following display: Two major findings came out of early visual search studies (e.g., Treisman & Gelade, 1980). First, finding the target is sometimes so easy that the target is said to "pop out" from the array. Searches in which at least one feature always differentiates targets from distractors (in the above example, color) are called feature searches. In feature searches, the time to find the target is not affected by the number of irrelevant distractor stimuli: people are just as fast to spot the red letter whether there's one blue letter or a dozen. In conjunction searches, participants must consider at least two features. For example, a conjunction search would be finding a red X in an array of blue X's and red T's, meaning that the conjunction of two features (shape and color) is required to isolate the target. In conjunction searches, the number of distractors matter: search times increase linearly with the number of distractors. Thus, whereas feature searches are fast, parallel, and independent of distractor stimuli, conjunction searches are slow, serial, and depend on the number of distractors. The feature integration theory is often used to explain these results (Treisman & Gelade, 1980). According to feature integration theory, the features or characteristics (e.g., shape, color, etc.) of objects we see are coded independently (but in parallel) early in visual processing. For example, at the earliest stages of processing a red X, independent, unconnected features are being activated for "red" and for "X". Only later are those features "integrated" into a unified "red x" representation. In a feature search, features don't need to be integrated to complete the search, so the search is rapid. Conjunction searches are slower because that integration has to happen in order to distinguish targets from distractors. **Added by Craig** Article on the STM capacity for feature and conjunction searches (Luck & Vogel, 1997). And another
  • 48. frequently cited article (Wolfe, 1994). Results For the standard experiment, the dependent variable will usually be reaction time. The most likely independent variables will be the number of items in the study set, and the type of search (feature or conjunction). Based on past results (e.g., Treisman & Gelade, 1980), for feature searches, the search time is independent of set size. In contrast, for conjunction searches, reaction time should increase with set size. A repeated-measures ANOVA with search type (feature vs. conjunction) and set size as independent variables would be appropriate. Suggestions 1. Change the number of targets. Are feature searches always independent of set size, even when the number of possible targets is high? 2. How do search times change when target colors or target letter shapes are very similar (or dissimilar) to the distractors. References Treisman, A., & Gelade, G. (1980). A feature integration theory of attention. Cognitive Psychology, 12, 97-136. Luck, S. J., & Vogel, E. K. (1997). The capacity of visual working memory for features and conjunctions. Nature, 390(6657), 279–281. https://doi.org/10.1038/36846 Wolfe, J. M. (1994). Guided search 2.0: A revised model of visual search. Psychonomic Bulletin & Review, 1(2), 202–238. https://doi.org/10.3758/BF03200774 Grading Rubric for PY-356 Research Proposal Name: _______________________ Point Value
  • 49. (total) ________ ________ ________ ________ ________ 1. Introduction (5 points each, 20 points total) a. Purpose/Importance of the study is clearly explained b. Prior related research is clearly summarized and connected c. Concludes with a clearly stated research Hypothesis d. Includes citations from at least 5 peer-reviewed journal articles e. Proper APA style formatting (style, grammar, organization) in title page, body of introduction, and in-text citations. ________ Qualitative Feedback: Good things: Areas for improvement: (total) ________
  • 50. ________ ________ ________ ________ 2. Method (10 points) a. Independent variables are conceptually and operationally defined b. Adequate/Clear description of participants (i.e., selection, censoring, characteristics) c. Adequate/Clear description of research design d. Adequate/Clear description of experimental procedure e. Proper APA style formatting Qualitative Feedback: Good things: Areas for improvement: Grading Rubric for PY-356 Research Proposal ________ Introduction Paper Rubric Paper Rubric_Methods Student Name: good things: areas for improvement: 2 Dropdown: [4]3 Dropdown: [4]4 Dropdown: [4]5 Dropdown:
  • 51. [4]6 Dropdown: [4]7 Dropdown: [1]Good_Things: Areas_For_Improvement: 8 Dropdown: [2]9 Dropdown: [2]10 Dropdown: [2]11 Dropdown: [2]12 Dropdown: [2]1 Dropdown: [20]