Direct perception Ecological realism and perceptionaction PJ Treffner

  • Slides: 17
Download presentation
Direct perception: Ecological realism and perception-action PJ Treffner metaffordance. com click

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

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

Dynamic occlusion: Accretion & deletion of optical structure 2 Deletion of optical structure by

Dynamic occlusion: Accretion & deletion of optical structure 2 Deletion of optical structure by stationary surface specifies: 1) an edge 2) moving object is FARTHER

Dynamic occlusion: Accretion & deletion of optical structure Deletion (hiding) and accretion (revealing) of

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

Dynamic occlusion: Accretion & deletion of optical structure We do not need an edge

Dynamic occlusion: Accretion & deletion of 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.

Deletion & accretion of optical structure Deletion & accretion specifies: 1) edges 2) moving

Deletion & accretion of optical structure Deletion & accretion specifies: 1) edges 2) moving object is NEARER 3) enhanced “ 3 D” effect

We do not need stimulation to perceive existence

We do not need stimulation to perceive existence

Unusual conditions: surprise & attention

Unusual conditions: surprise & attention

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

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

Summary: Dynamic occlusion We do not need a line to see a line (the

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 see that something exists Relative motion is sufficient to experience “depth” (no need to have two eyes to create stereo 3 D, etc) The information specifying reality is a higher-order relation in the optic array

Indirect Perception “Stimulus” “Response” Cue 1 Cue 2 “World” Perception Cue 3 Cue 4

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

Direct Perception (“direct realism” or “ecological approach”) Environmental property or event: affordances Information Perception

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

Affordances: the perceived properties of the environment • Information is detected… • but affordances

Affordances: the perceived properties 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

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

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

Summary: ecological realism • Perception is based on information, not on sensations. The sensations

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 invariants embedded within the optic array; • The invariants can be detected by suitably attuned and active perceptual system; • Information specifies affordances, the real opportunities for action in the real world. • 2012: Searle finally acknowledges that Gibson “is on the right track”: On action: http: //www. youtube. com/watch? v=c. Cp_Y 9 q. F 2 ok#t=06 m 08 s On Gibson: http: //www. youtube. com/watch? v=c. Cp_Y 9 q. F 2 ok#t=07 m 18 s On direct perception: http: //www. youtube. com/watch? v=c. Cp_Y 9 q. F 2 ok#t=29 m 20 s

Perceptionaction mediation in music Stefan Koelsch Perception ofPerceptionaction mediation in music Stefan Koelsch Perception of
Ecological hierarchy ecological organization ecological components ECOLOGICAL HIERARCHYEcological hierarchy ecological organization ecological components ECOLOGICAL HIERARCHY
Victorian Poetry and Realism Victorian Realism Victorian RealismVictorian Poetry and Realism Victorian Realism Victorian Realism
Realism and Naturalism Realism in General Realism wasRealism and Naturalism Realism in General Realism was
Realism and Naturalism 1865 1910 Realism Realism isRealism and Naturalism 1865 1910 Realism Realism is
Realism Two categories Contemporary Realism Historical Fiction RealismRealism Two categories Contemporary Realism Historical Fiction Realism
Realism Two categories Contemporary Realism Historical Fiction RealismRealism Two categories Contemporary Realism Historical Fiction Realism
Magical Realism Magical Realism Magical realism is theMagical Realism Magical Realism Magical realism is the
UNIT3 Perception Perception Perception Perception Write a storyUNIT3 Perception Perception Perception Perception Write a story
Realism Realism It is the perception of aRealism Realism It is the perception of a
Ecological Footprint Ecological Footprints Ecological Footprint is aEcological Footprint Ecological Footprints Ecological Footprint is a
Ecological Pyramids Ecological Pyramids Three types of ecologicalEcological Pyramids Ecological Pyramids Three types of ecological
Ecological Pyramids Ecological Pyramid An ecological pyramid isEcological Pyramids Ecological Pyramid An ecological pyramid is
Food Webs Ecological Pyramids Ecological Niche Ecological nicheFood Webs Ecological Pyramids Ecological Niche Ecological niche
PERCEPTION Perception What is perception and how doesPERCEPTION Perception What is perception and how does
Perception Perception Definition Perception The organization identification andPerception Perception Definition Perception The organization identification and