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PSYCH 2220 Perception Lecture 9. COLOUR Trichromacy cones, three photopigments, long wavelength, medium wavelength, short wavelength, colour matching, 'normal' need three lights, colour blindness Opponency

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PSYCH 2220

Perception

Lecture 9


COLOUR

Trichromacy

cones, three photopigments, long wavelength, medium wavelength, short wavelength, colour matching, 'normal' need three lights, colour blindness

Opponency

adaptation, colour after-effect, lateral inhibition (at level of retinal ganglion cells)


VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions



BOTTOM UP….

TOP DOWN ….


BOTTOM UP

1 eye movements

2 limited acuity

3 physiological confusion


response level

cells in a hypercolumn minding their own business


response level

when a bar comes on they give a response…


response level

But the cells are wired together with INHIBITORY connections


response level

so highly active cells inhibit their neighbours the most


response level

which releases the higher-firing cells from inhibition

and makes them fire more, bringing out the signal better


response level

Now we add some other lines..


response level

Which activate the cells tuned to those orientations…


response level

Which pulls down the response of the vertically tuned cell



BOTTOM UP

1 eye movements

2 limited acuity

3 physiological confusion

TOP DOWN

1 empathy

2 “good figure”

3 perspective


big thing

far

small thing

close

EMMERT’s LAW

If retinal image stays the same

then perceived size will depend on distance




EMPIRICIST

(all knowledge comes from experience)

NATIVIST

(knowledge is ‘a priori’; you are born with it)


EVIDENCE

1 Animal behaviour

2 Blind people recovering their sight

3 Babies’ visual development

4 Adaptation experiments

5 Controlled rearing experiments



Molyneux’s question:

“could a man born blind distinguish a

sphereand a cube by sight alone?”

2 blind people recovering sight







EVIDENCE

Animal behavour

Blind people recovering their sight

Babies’ visual development

Adaptation experiments

Controlled rearing experiments

……………………. Nativist

… Empiricist & nativist

…………. Empiricist & nativist

…………… Empiricist

……….. Empiricist


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