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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

PSYCH 2220

Perception

Lecture 9


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)


Psych 2220 perception lecture 9

VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


Psych 2220 perception lecture 9

VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


Psych 2220 perception lecture 9

VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions


Psych 2220 perception lecture 9

VISUAL ILLUSIONS

A classification system:

1 Adaptation illusions

2 Simulation illusions

3 Incompatible cue illusions

4 Geometric illusions



Psych 2220 perception lecture 9

BOTTOM UP….

TOP DOWN ….


Psych 2220 perception lecture 9

BOTTOM UP

1 eye movements

2 limited acuity

3 physiological confusion


Psych 2220 perception lecture 9

response level

cells in a hypercolumn minding their own business


Psych 2220 perception lecture 9

response level

when a bar comes on they give a response…


Psych 2220 perception lecture 9

response level

But the cells are wired together with INHIBITORY connections


Psych 2220 perception lecture 9

response level

so highly active cells inhibit their neighbours the most


Psych 2220 perception lecture 9

response level

which releases the higher-firing cells from inhibition

and makes them fire more, bringing out the signal better


Psych 2220 perception lecture 9

response level

Now we add some other lines..


Psych 2220 perception lecture 9

response level

Which activate the cells tuned to those orientations…


Psych 2220 perception lecture 9

response level

Which pulls down the response of the vertically tuned cell



Psych 2220 perception lecture 9

BOTTOM UP

1 eye movements

2 limited acuity

3 physiological confusion

TOP DOWN

1 empathy

2 “good figure”

3 perspective


Psych 2220 perception lecture 9

big thing

far

small thing

close

EMMERT’s LAW

If retinal image stays the same

then perceived size will depend on distance




Psych 2220 perception lecture 9

EMPIRICIST

(all knowledge comes from experience)

NATIVIST

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


Psych 2220 perception lecture 9

EVIDENCE

1 Animal behaviour

2 Blind people recovering their sight

3 Babies’ visual development

4 Adaptation experiments

5 Controlled rearing experiments



Psych 2220 perception lecture 9

Molyneux’s question:

“could a man born blind distinguish a

sphereand a cube by sight alone?”

2 blind people recovering sight







Psych 2220 perception lecture 9

EVIDENCE

Animal behavour

Blind people recovering their sight

Babies’ visual development

Adaptation experiments

Controlled rearing experiments

……………………. Nativist

… Empiricist & nativist

…………. Empiricist & nativist

…………… Empiricist

……….. Empiricist