This document provides an overview of human psychology and cognition, including:
- The human senses of vision, hearing, touch, and movement and how we process sensory information.
- Memory systems including sensory memory, short-term memory, and long-term memory.
- Thinking processes like reasoning, problem solving, and decision making.
- How emotion influences human capabilities and performance.
- Individual differences in abilities and how contexts like stress can impact cognition.
- Applications of psychological principles to the design of interactive systems.
این ارائه در کارگاه توانبخشی توجه از سری کارگاه های آخر هفته های شناختی توسط دکتر مهدی علیزاده تدریس شده است. برای مشاهده دیگر ارائه ها، به وب سایت فروردین به آدرس زیر مراجعه کنید:
www.farvardin-group.com
Memory is the term given to the structures and processes involved in the storage and subsequent retrieval of information.
Memory is essential to all our lives. Without a memory of the past we cannot operate in the present or think about the future. We would not be able to remember what we did yesterday, what we have done today or what we plan to do tomorrow.
Without memory we could not learn anything.
Memory is involved in processing vast amounts of information.
This information takes many different forms, e.g. images, sounds or meaning.
این ارائه در کارگاه توانبخشی توجه از سری کارگاه های آخر هفته های شناختی توسط دکتر مهدی علیزاده تدریس شده است. برای مشاهده دیگر ارائه ها، به وب سایت فروردین به آدرس زیر مراجعه کنید:
www.farvardin-group.com
Memory is the term given to the structures and processes involved in the storage and subsequent retrieval of information.
Memory is essential to all our lives. Without a memory of the past we cannot operate in the present or think about the future. We would not be able to remember what we did yesterday, what we have done today or what we plan to do tomorrow.
Without memory we could not learn anything.
Memory is involved in processing vast amounts of information.
This information takes many different forms, e.g. images, sounds or meaning.
Chapter 1: The human
from
Dix, Finlay, Abowd and Beale (2004).
Human-Computer Interaction, third edition.
Prentice Hall. ISBN 0-13-239864-8.
http://www.hcibook.com/e3/
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
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How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. the human
• Information i/o …
– visual, auditory, haptic, movement
• Information stored in memory
– sensory, short-term, long-term
• Information processed and applied
– reasoning, problem solving, skill, error
• Emotion influences human capabilities
• Each person is different
3. Vision
Two stages in vision
• physical reception of stimulus
• processing and interpretation of
stimulus
4. The Eye - physical reception
• mechanism for receiving light and
transforming it into electrical energy
• light reflects from objects
• images are focused upside-down on
retina
• retina contains rods for low light vision
and cones for colour vision
• ganglion cells (brain!) detect pattern
and movement
5. Interpreting the signal
• Size and depth
– visual angle indicates how much of view
object occupies
(relates to size and distance from eye)
– visual acuity is ability to perceive detail
(limited)
– familiar objects perceived as constant size
(in spite of changes in visual angle when far away)
– cues like overlapping help perception of
size and depth
6. Interpreting the signal (cont)
• Brightness
– subjective reaction to levels of light
– affected by luminance of object
– measured by just noticeable difference
– visual acuity increases with luminance as does
flicker
• Colour
– made up of hue, intensity, saturation
– cones sensitive to colour wavelengths
– blue acuity is lowest
– 8% males and 1% females colour blind
7. Interpreting the signal (cont)
• The visual system compensates for:
– movement
– changes in luminance.
• Context is used to resolve ambiguity
• Optical illusions sometimes occur due to
over compensation
9. Reading
• Several stages:
– visual pattern perceived
– decoded using internal representation of language
– interpreted using knowledge of syntax, semantics,
pragmatics
• Reading involves saccades and fixations
• Perception occurs during fixations
• Word shape is important to recognition
• Negative contrast improves reading from
computer screen
10. Hearing
• Provides information about environment:
distances, directions, objects etc.
• Physical apparatus:
– outer ear – protects inner and amplifies sound
– middle ear – transmits sound waves as
vibrations to inner ear
– inner ear – chemical transmitters are released
and cause impulses in auditory nerve
• Sound
– pitch – sound frequency
– loudness – amplitude
– timbre – type or quality
11. Hearing (cont)
• Humans can hear frequencies from 20Hz to
15kHz
– less accurate distinguishing high frequencies than
low.
• Auditory system filters sounds
– can attend to sounds over background noise.
– for example, the cocktail party phenomenon.
12. Touch
• Provides important feedback about environment.
• May be key sense for someone who is visually impaired.
• Stimulus received via receptors in the skin:
– thermoreceptors – heat and cold
– nociceptors – pain
– mechanoreceptors – pressure
(some instant, some continuous)
• Some areas more sensitive than others e.g. fingers.
• Kinethesis - awareness of body position
– affects comfort and performance.
13. Movement
• Time taken to respond to stimulus:
reaction time + movement time
• Movement time dependent on age, fitness etc.
• Reaction time - dependent on stimulus type:
– visual ~ 200ms
– auditory ~ 150 ms
– pain ~ 700ms
• Increasing reaction time decreases accuracy in
the unskilled operator but not in the skilled
operator.
14. Movement (cont)
• Fitts' Law describes the time taken to hit a
screen target:
Mt = a + b log2(D/S + 1)
where: a and b are empirically determined constants
Mt is movement time
D is Distance
S is Size of target
targets as large as possible
distances as small as possible
15. Memory
There are three types of memory function:
Sensory memories
Short-term memory or working memory
Long-term memory
Selection of stimuli governed by level of arousal.
19. Long-term memory (LTM)
• Repository for all our knowledge
– slow access ~ 1/10 second
– slow decay, if any
– huge or unlimited capacity
• Two types
– episodic – serial memory of events
– semantic – structured memory of facts,concepts, skills
semantic LTM derived from episodic LTM
20. Long-term memory (cont.)
• Semantic memory structure
– provides access to information
– represents relationships between bits of information
– supports inference
• Model: semantic network
– inheritance – child nodes inherit properties of parent
nodes
– relationships between bits of information explicit
– supports inference through inheritance
22. Models of LTM - Frames
• Information organized in data structures
• Slots in structure instantiated with values for instance
of data
• Type–subtype relationships
DOG
Fixed
legs: 4
Default
diet: carniverous
sound: bark
Variable
size:
colour
COLLIE
Fixed
breed of: DOG
type: sheepdog
Default
size: 65 cm
Variable
colour
23. Models of LTM - Scripts
Model of stereotypical information required to interpret situation
Script has elements that can be instantiated with values for context
Script for a visit to the vet
Entry conditions: dog ill
vet open
owner has money
Result: dog better
owner poorer
vet richer
Props: examination table
medicine
instruments
Roles: vet examines
diagnoses
treats
owner brings dog in
pays
takes dog out
Scenes: arriving at reception
waiting in room
examination
paying
Tracks: dog needs medicine
dog needs operation
24. Models of LTM - Production rules
Representation of procedural knowledge.
Condition/action rules
if condition is matched
then use rule to determine action.
IF dog is wagging tail
THEN pat dog
IF dog is growling
THEN run away
25. LTM - Storage of information
• rehearsal
– information moves from STM to LTM
• total time hypothesis
– amount retained proportional to rehearsal time
• distribution of practice effect
– optimized by spreading learning over time
• structure, meaning and familiarity
– information easier to remember
26. LTM - Forgetting
decay
– information is lost gradually but very slowly
interference
– new information replaces old: retroactive
interference
– old may interfere with new: proactive inhibition
so may not forget at all memory is selective …
… affected by emotion – can subconsciously `choose' to
forget
27. LTM - retrieval
recall
– information reproduced from memory can be
assisted by cues, e.g. categories, imagery
recognition
– information gives knowledge that it has been seen
before
– less complex than recall - information is cue
29. Deductive Reasoning
• Deduction:
– derive logically necessary conclusion from given
premises.
e.g. If it is Friday then she will go to work
It is Friday
Therefore she will go to work.
• Logical conclusion not necessarily true:
e.g. If it is raining then the ground is dry
It is raining
Therefore the ground is dry
30. Deduction (cont.)
• When truth and logical validity clash …
e.g. Some people are babies
Some babies cry
Inference - Some people cry
Correct?
• People bring world knowledge to bear
31. Inductive Reasoning
• Induction:
– generalize from cases seen to cases unseen
e.g. all elephants we have seen have trunks
therefore all elephants have trunks.
• Unreliable:
– can only prove false not true
… but useful!
• Humans not good at using negative evidence
e.g. Wason's cards.
32. Wason's cards
Is this true?
How many cards do you need to turn over to find out?
…. and which cards?
If a card has a vowel on one side it has an even number on the other
7 E 4 K
33. Abductive reasoning
• reasoning from event to cause
e.g. Sam drives fast when drunk.
If I see Sam driving fast, assume drunk.
• Unreliable:
– can lead to false explanations
34. Problem solving
• Process of finding solution to unfamiliar task
using knowledge.
• Several theories.
• Gestalt
– problem solving both productive and reproductive
– productive draws on insight and restructuring of problem
– attractive but not enough evidence to explain `insight'
etc.
– move away from behaviourism and led towards
information processing theories
35. Problem solving (cont.)
Problem space theory
– problem space comprises problem states
– problem solving involves generating states using legal
operators
– heuristics may be employed to select operators
e.g. means-ends analysis
– operates within human information processing system
e.g. STM limits etc.
– largely applied to problem solving in well-defined areas
e.g. puzzles rather than knowledge intensive areas
36. Problem solving (cont.)
• Analogy
– analogical mapping:
• novel problems in new domain?
• use knowledge of similar problem from similar domain
– analogical mapping difficult if domains are semantically
different
• Skill acquisition
– skilled activity characterized by chunking
• lot of information is chunked to optimize STM
– conceptual rather than superficial grouping of problems
– information is structured more effectively
37. Errors and mental models
Types of error
• slips
– right intention, but failed to do it right
– causes: poor physical skill,inattention etc.
– change to aspect of skilled behaviour can cause slip
• mistakes
– wrong intention
– cause: incorrect understanding
humans create mental models to explain behaviour.
if wrong (different from actual system) errors can occur
38. Emotion
• Various theories of how emotion works
– James-Lange: emotion is our interpretation of a
physiological response to a stimuli
– Cannon: emotion is a psychological response to a
stimuli
– Schacter-Singer: emotion is the result of our
evaluation of our physiological responses, in the
light of the whole situation we are in
• Emotion clearly involves both cognitive and
physical responses to stimuli
39. Emotion (cont.)
• The biological response to physical stimuli is
called affect
• Affect influences how we respond to situations
– positive creative problem solving
– negative narrow thinking
“Negative affect can make it harder to do
even easy tasks; positive affect can make
it easier to do difficult tasks”
(Donald Norman)
40. Emotion (cont.)
• Implications for interface design
– stress will increase the difficulty of problem
solving
– relaxed users will be more forgiving of
shortcomings in design
– aesthetically pleasing and rewarding
interfaces will increase positive affect
41. Individual differences
• long term
– sex, physical and intellectual abilities
• short term
– effect of stress or fatigue
• changing
– age
Ask yourself:
will design decision exclude section of user
population?
42. Psychology and the Design of
Interactive System
• Some direct applications
– e.g. blue acuity is poor
blue should not be used for important detail
• However, correct application generally requires
understanding of context in psychology, and an
understanding of particular experimental conditions
• A lot of knowledge has been distilled in
– guidelines (chap 7)
– cognitive models (chap 12)
– experimental and analytic evaluation techniques (chap 9)
Editor's Notes
=Movement time is dependent largely on the physical characteristics of the subjects:
their age and fitness.
=Reaction time varies according to the sensory
channel through which the stimulus is received
=Information remains in iconic memory very briefly, in the order of 0.5 seconds.