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Direct perception: Ecological realism and perception-action PJ Treffner metaffordance

Direct perception: Ecological realism and perception-action PJ Treffner metaffordance.com. click. Dynamic occlusion: Accretion & deletion of optical structure (Gibson, 1969). Deletion of optical structure by moving surface specifies: 1) an edge 2) moving object is NEARER.

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Direct perception: Ecological realism and perception-action PJ Treffner metaffordance

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  1. Direct perception: Ecological realism and perception-action PJ Treffnermetaffordance.com click

  2. Dynamic occlusion: Accretion & deletionof optical structure (Gibson, 1969) Deletion of optical structure by moving surface specifies:1) an edge2) movingobject is NEARER

  3. Dynamic occlusion: Accretion & deletionof optical structure 2 Deletion of optical structure by stationary surface specifies:1) an edge2) movingobject is FARTHER

  4. Dynamic occlusion: Accretion & deletionof optical structure Deletion (hiding) and accretion (revealing) of optical structure specifies edges of an object.

  5. Dynamic occlusion: Accretion & deletionof optical structure We do not need an edge to see an edge! The information for an edge is NOT an edge! The information for an edge is a higher-order relation in the optic array.

  6. Deletion & accretion of optical structure Deletion & accretion specifies:1) edges2) moving object is NEARER3) enhanced “3D” effect

  7. We do not need stimulation to perceive existence

  8. Unusual conditions: surprise & attention

  9. Point light displays Link: http://www.biomotionlab.ca/Demos/BMLwalker.html

  10. Summary:Dynamic occlusion We do not need a line to see a line (the information for a line is not a line) The information for a thing is not the thing We do not need “continuous stimulation” to seethat something exists Relative motion is sufficient to experience “depth”(no need to have two eyes to create stereo 3D, etc) The information specifying reality is a higher-order relation in the optic array

  11. Indirect Perception “Response” “Stimulus” Cue 1 Cue 2 Perception “World” Cue 3 Cue 4 “causes”??

  12. Direct Perception Environmental property or event:affordances THE WORLD Information Perception “is lawfully specific to” (“direct realism” or “ecological approach”)

  13. Affordances: the perceivedproperties of the environment • Information is detected… • but affordances are perceived a) If information is specific to the environment and b) If perception is specific to information then c) perception can be specific to the environment

  14. Information specific to constrains Intention- Attention Action constrains Information reveals PERCEPTION-ACTION CYCLE Perception

  15. Summary: ecological realism • Perception is based on information, not on sensations. The sensations are mere side-effects and irrelevant for an explanation; • The information for a thing is not the thing… • The information consists of higher-order properties, the invariantsembedded within the optic array; • The invariants can be detected by suitably attuned and active perceptual system; • Information specifies affordances, the realopportunities for action in the realworld. • 2012: Searle finally acknowledges that Gibson “is on the right track”:On action: http://www.youtube.com/watch?v=cCp_Y9qF2ok#t=06m08sOn Gibson: http://www.youtube.com/watch?v=cCp_Y9qF2ok#t=07m18sOn direct perception: http://www.youtube.com/watch?v=cCp_Y9qF2ok#t=29m20s

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