Vwm20091013

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Vwm20091013

  1. 1. The Comparison of Visual Working Memory Representations With Perceptual Inputs Hyun, Woodman, Vogel, Hollingworth, & Luck JEP: HPP 2009
  2. 2. <ul><li>Changes can be detected by means of an unlimited-capacity comparison process, which can be used to direct covert and overt attention but that manual responses depend on a limited-capacity process. </li></ul><ul><li>The unlimited-capacity comparison process can be limited to specificfeature dimensions. </li></ul>
  3. 3. Visual Working Memory (VWM) <ul><li>Working memory : A memory system that holds information temporarily so that it can be used in the service of some task. </li></ul><ul><li>Visual Working Memory Representations & Perceptual Inputs </li></ul>
  4. 4. The Change Detection Task <ul><li>Commonly used to study the nature of the VWM representations. </li></ul><ul><li>form a perceptual representation-> </li></ul><ul><li>transformed into a stable working memory representation -> </li></ul><ul><li>maintained across the retention interval -> </li></ul><ul><li>be compared with the sensory input -> </li></ul><ul><li>generate a single two-alternative response </li></ul>
  5. 5. Prior Research on Perceptual Comparison <ul><li>Taylor (1976) </li></ul>
  6. 6. A Theoretical Framework <ul><li>The change detection task can be considered a type of visual search task. </li></ul><ul><li>three issues </li></ul><ul><li>limited- or unlimited-capacity perceptual process </li></ul><ul><li>presence of a feature & absence of a feature. </li></ul><ul><li>voluntarily or involuntarily attracted </li></ul>
  7. 7. <ul><li>three subhypotheses </li></ul><ul><li>means of an unlimited capacity comparison process </li></ul><ul><li>comparison asymmetry (search asymmetry effect) </li></ul><ul><li>a shift of attention to the changed item (voluntary) </li></ul><ul><li>key difference </li></ul><ul><li>the initial comparison process is unlimited in capacity in two important ways </li></ul>
  8. 8. Experiment 1: Relating Change Detection to Perceptual Comparison
  9. 11. Experiment 2: Allocation of Covert Attention to the Changed Item
  10. 15. Experiment 3: Allocation of Overt Attention to the Changed Item
  11. 16. Experiments 4A and 4B: Effects of Set Size on Manual RTs
  12. 17. Experiment 5: Do Changes Attract Attention Involuntarily?
  13. 20. Overview of the Present Study <ul><li>RT increases much more steeply as a function of set size in the any-sameness task. (Exp1) </li></ul><ul><li>The presence of a changed item in the test array in the any-difference task leads to a shift of attention to the location of this item. (Exp2&3) </li></ul>
  14. 21. Overview of the Present Study <ul><li>a limited-capacity process is interposed between the shift of attention and the observer’s button-press response. (Exp4A&4B) </li></ul><ul><li>The shift of attention to a changed item is under voluntary control. (Exp5) </li></ul>
  15. 23. General Discussion <ul><li>Similarities Between Change Detection and Visual Search </li></ul><ul><li>Limited- and Unlimited-Capacity Comparison Processes in Change Detection </li></ul>

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