visual perception

Created by: lewis
Created on: 02-12-15 21:33

The eye receives __ much information to send to the brain. It therefore encodes this information sending changes in __ and __

too, time (e.g. movement) , space (e.g. edges)

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Encoding is achieved through __

inhibition.

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Inhibition over time >

after-effect type illusions

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Inhibition over space >

simultaneous contract type illusions.

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The brain has to reconstruct (decode) the image. It does this via __

excitation.

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Excitation leads to a third type of illusion..

filling in.

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Sensory processing starts where? The retina is part of

starts in the eye, retina part of the brain.

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Receptive fields:

cells only see a small part of space.

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Receptive field structure:

cells respond to light differently in different parts of their receptive fields.

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Centre-Surround:

Retinal ganglion cells have a centre surround receptive field structure. (produces inhibition over space)

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many retinal ganglion cells also respond to sudden changes in light over time.

If the light stays on the cells are inhibition. (inhibition over time)

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Sudden removal of a prolonged image produces..

an after image because inhibition has time lag.

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We get colour vision by having..

3 cone photoreceptor types.

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The 4th photoreceptor type (rods) support

night vision. We're all colour blind at night.

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Cerebral chromatopsia / cortical colour blindness results from..

a loss of area V8. Vital for conscious colour perception.

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Colour system is arranged much like spatial vision with:

1) centre-surround cells in the retina where centre and surround prefer different colours. 2) filling in in area V1. 3) thus we get simultaneous colour contrast, colour after-effects and the water colour illusion.

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Colour constancy is our ability to..

ignore the colour of the light source (in V4/V8)

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Other cards in this set

Card 2

Front

Encoding is achieved through __

Back

inhibition.

Card 3

Front

Inhibition over time >

Back

Card 4

Front

Inhibition over space >

Back

Card 5

Front

The brain has to reconstruct (decode) the image. It does this via __

Back

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visual perception