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Lecture notes- Cognitive Psychology: Vision for action
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Lecture notes for Vision for Action module in BSc Psychology degree
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L10- Vision for actionWhy do we see?
Information in ‘active vision’
Spatial structure of scenes
- Orientation + layout of objects + surfaces
Motion
- Direction + speed of moving objects (obstacles)
- Optic flow
Depth
- Distance information
Affordances
- Action-inducing objects properties
Affordances
Properties of the environment
- Surfaces of object in scenes
Potential functional relations
- For acting upon- for behaviour
Surfaces as the essence of our environment
Gibson (1986) on affordance
It implies the complementarity of the animal + the environment
“The affordances of the environment are what it offers the animal, what it provides or
furnishes- either for good or ill”
, Redefining the study of vision
How is vision possible?
- Mechanics of processing visual input
- Psychophysics, computational theories
- Interfacing with memory e.g. recognition
How does vision guide our behaviour?
- Actions in scenes + towards objects
- Selection of objects for action
Neuropsychological evidence
Hypothesis- selective damage to dorsal/ventral stream should generate deficits specific
to that stream’s function
Patients with visual cortical damage show selective deficits that match the
dorsal/ventral interpretation
Ventral stream deficits
Category-specific deficits
- Naming living vs non-living objects
- Often temporal lobe deficit i.e. ventral stream
Visual object agnosia
- Problems recognising objects/forms
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