Vision in Mammals

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How can orientation selectivity be superimposed?
On a reintopic map.
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Where do afferent pathways from the thalamus arrive?
In layer 4 of the striate cortex.
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In what aspect of feeding are primates unique?
They take the food to their mouth, as opposed to moving their mouth to the food.
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How is the VF of a primate adapted for looking at what the hand is doing (4)?
The eyes have a central fovea, both eyes point forwards, the eyes are yoked together, the eyes are separate so they see the world slightly differently.
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What are some features of the fovea (3)?
Adapted to produce a sharp image, only cone cells of high density, reduced scattering of light by blood vessels and other cells.
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What provides depth information (3)?
Amount of horizontal rotation in the eyes, vergence and accommodation, differences between images from each eye.
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What is binocular stereopsis?
The brain fuses together two images and gives the sensation of depth.
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How can we judge distances greater than 3m?
With access to contextual knowledge.
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What is the dorsal stream?
Used for interacting with the world and best at large moving objects. It has areas expert in grasping, reading and analysing motion.
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What is the ventral stream?
Used for making sense of the world and best at static detail. It has areas for analysing object size and colour.
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What are cells is the parietal cortex experts in?
Recognising where things of interest are in relation to body parts.
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What do cells in macaque lateral interparietal area do?
Fire when a visual target is in its receptive field.
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What tricks do humans learn for judging relative size of objects (5)?
Parietal occlusion, relative size, texture gradients, linear perspective, colour.
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Where is the face cell?
In the inferotemporal cortex of macaque.
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How does colour vision occur?
It results from different types of opsin with different spectral sensitivities.
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What are the three opsin genes?
S, L and M.
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What causes red-green colour blindness?
Absence of the gene encoding the L-receptor.
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Card 2

Front

Where do afferent pathways from the thalamus arrive?

Back

In layer 4 of the striate cortex.

Card 3

Front

In what aspect of feeding are primates unique?

Back

Preview of the front of card 3

Card 4

Front

How is the VF of a primate adapted for looking at what the hand is doing (4)?

Back

Preview of the front of card 4

Card 5

Front

What are some features of the fovea (3)?

Back

Preview of the front of card 5
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