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Experience Dependent Object Perception

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Experience Dependent Object Perception. Richard Zemel Computer Science Department University of Toronto. Two Sets of Experiments. 1. To what degree is object perception invariant? Familiarity Naming Reference-Frames. . 2. What is the role of experience in completion?

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Experience Dependent Object Perception

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  1. Experience Dependent Object Perception Richard Zemel Computer Science Department University of Toronto

  2. Two Sets of Experiments 1. To what degree is object perception invariant? Familiarity Naming Reference-Frames .2. What is the role of experience in completion? Novel occluded shapes Occlusion without occluders

  3. Collaborators • Mary Peterson • Larry James • Dave Towers • Marlene Behrmann • Mike Mozer • Daphne Bevalier

  4. Sample Stimuli

  5. Familiarity: Methods • Training Phase: 16 stimuli, fixed locations • passive viewing (6 blocks) • active: old/new discrimination (2 blocks) • [repeat] • Testing Phase (2 blocks) • new trials -- 16 distractors • old trials -- half of learned objects: • stay in learned location • shift to diagonally-opposite location

  6. Familiarity: Accuracy

  7. Familiarity: RT

  8. Naming: Methods • Training Phase [8 rounds]: 8 named objects • passive [2 blocks]: (160 ms) GIX(500 ms) • active [1 block]: (160 ms) keyboard (feedback) • Testing Phase [6 rounds]: half shift sides, half stay • passive [2 blocks] • active [1 block]: (no feedback)

  9. Naming: Accuracy

  10. Reference-Frames: Variations

  11. Reference-Frames: Methods • Training Phase [2 rounds]: 16 objects • passive [6 blocks]: • active [2 blocks]: old/new(f-back) • Testing Phase: same/different retinal & screen locs • active [2 blocks]: old-new

  12. Reference-Frames: Conditions

  13. Reference-Frames: Results

  14. Experience Dependence When Objects Irrelevant? • Many properties of objects not invariant, but rather depend on experience • Evidence from experiments in which object memory directly relevant to task • Is experience important when the object is unnecessary to accomplish task?

  15. Object attention & occlusion

  16. Object attention sensitive to layout

  17. Object attention & experience

  18. Experience affects object attention

  19. Completion without occluder? Subjects complete fragments given experience with potential linking shape: Is evidence of occlusion required?

  20. Completion w/o occluder: Methods • Phase 1: Ends displays • Phase 2: V displays • Phase 3: Ends and Vs

  21. Missing Occluder: Results

  22. Conclusions • Memories of novel objects are specific to learned locations • Both retinal & screen coordinates involved, so not just episodic memory • Object attention applies to recently viewed novel shapes • Experience-dependent object effects can apply to fragments without occluder

  23. Current Directions • Duration of effects • Generalization • Amount of experience required

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