The comparison of VWM representations with perceptual inputs Hyun, Woodman, Vogel, Hollingworth, & Luck JEP: HPP 2009
key point  <ul><li>Detecting the change requires the comparison of VWM representations </li></ul><ul><li>Discover the natu...
Outline  Manipulation across the article: the set size (1, 2, 3, 4) Task & method Dependent variable Main findings Exp 1 C...
Change detection and perceptual comparison <ul><li>In the one-shot version, the process of comparing a VWM representation ...
Change detection and perceptual comparison <ul><li>Critical feature: sameness or difference (Taylor, 1976) </li></ul>
Outline: again  Manipulation across the article: the set size (1, 2, 3, 4) Task & method Dependent variable Main findings ...
Exp1 <ul><li>2(task demand) x 4(set size) x 2 (critical feature: 0/1) </li></ul>Any-sameness
Exp2 <ul><li>Number of displayed stimuli remain constant, only the number of attended color stimuli changed </li></ul><ul>...
Exp2 Only P3’s latency is significant
Exp3 <ul><li>Change-localization task: move your eyes to the change ASAP </li></ul>**
Exp4 <ul><li>Different measurement of onset latency </li></ul><ul><li>A touch screen was used in experiment 4B </li></ul>
Exp5 <ul><li>2(change or not) x 2(relevancy of the demand) </li></ul>
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The Comparison Of Vwm Representations With Perceptual Inputs

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The Comparison Of Vwm Representations With Perceptual Inputs

  1. 1. The comparison of VWM representations with perceptual inputs Hyun, Woodman, Vogel, Hollingworth, & Luck JEP: HPP 2009
  2. 2. key point <ul><li>Detecting the change requires the comparison of VWM representations </li></ul><ul><li>Discover the natural of the comparison process </li></ul><ul><li>Relating the change detection task to the general visual search task </li></ul>
  3. 3. Outline Manipulation across the article: the set size (1, 2, 3, 4) Task & method Dependent variable Main findings Exp 1 Change or sameness detection (behavior) Reaction time Change detection as a special case of visual search Exp 2 Change detection on attended items (ERP) N2pc ( & P3 ) Unlimited comparison capacity Exp 3 Change-localization task (eye tracker) Saccade onset latency Limited process involved in the change detection Exp 4A & 4B Change-localization task (behavior) “ Reaction” latency Limited process is interposed Exp 5 Change detection on attended features (ERP) Reaction time & N2pc Controlled process
  4. 4. Change detection and perceptual comparison <ul><li>In the one-shot version, the process of comparing a VWM representation with a sensory input is a key component of the change detection task </li></ul><ul><li>Processes involved: </li></ul><ul><ul><li>forming the representation  consolidation in VWM  retention  comparison  decision </li></ul></ul>
  5. 5. Change detection and perceptual comparison <ul><li>Critical feature: sameness or difference (Taylor, 1976) </li></ul>
  6. 6. Outline: again Manipulation across the article: the set size (1, 2, 3, 4) Task & method Dependent variable Main findings Exp 1 Change or sameness detection (behavior) Reaction time Change detection as a special case of visual search Exp 2 Change detection on attended items (ERP) N2pc ( & P3 ) Unlimited comparison capacity Exp 3 Change-localization task (eye tracker) Saccade onset latency Limited process involved in the change detection Exp 4A & 4B Change-localization task (behavior) “ Reaction” latency Limited process is interposed Exp 5 Change detection on attended features (ERP) Reaction time & N2pc Controlled process
  7. 7. Exp1 <ul><li>2(task demand) x 4(set size) x 2 (critical feature: 0/1) </li></ul>Any-sameness
  8. 8. Exp2 <ul><li>Number of displayed stimuli remain constant, only the number of attended color stimuli changed </li></ul><ul><li>In ERP exps, the ITI is randomly from 550 - 750 ms </li></ul><ul><li>N2pc, P1, & P3 </li></ul>
  9. 9. Exp2 Only P3’s latency is significant
  10. 10. Exp3 <ul><li>Change-localization task: move your eyes to the change ASAP </li></ul>**
  11. 11. Exp4 <ul><li>Different measurement of onset latency </li></ul><ul><li>A touch screen was used in experiment 4B </li></ul>
  12. 12. Exp5 <ul><li>2(change or not) x 2(relevancy of the demand) </li></ul>
  13. 13. Discussion
  14. 14. Discussion

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