Receptive fields and central representations for seeing stuff

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What is the neural pathway for visual perception?

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This one is technical asf sorry

27 Terms

1

What is the neural pathway for visual perception?

Light, Eye, lateral geniculate nucleus, striate cortex and frontal lobe

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2

What is the term for the neurological phenomena that links sensation to perception?

Receptive fields

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3

True or false: a 1:1 ganglion cell to receptor network can perceive size

False

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4

What needs to implemented to have a ganglion cell network that can perceive size?

multiple ganglion cells converging on one synapse

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5

What happens to ganglion cell action potential rates when light hits the center of the receptive field?

Increases

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6

What happens to ganglion cell action potential rates when light hits the periphery of the receptive field?

Decreases

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7

What must we implement in our ganglion cell model to have size AND boundary perception?

Converging and inhibitory neurons

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8

What is the name given to the model that shows how light sensitivity can be explained with receptive fields?

Herman Grid

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9

What happens when you stimulate the center of an off-center receptive field?

Inhibitory response

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10

What happens when you stimulate the periphery of an off-center receptive field

excitatory response

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11

Describe a +Red -Green opponent channel as a receptive field

On center receptive field, M cones occupy the periphery and L cones occupy the center

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12

What is the role of the Lateral geniculate nucleus in vision perception?

A relay center between the eyes and higher areas of the brain

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13

What is the term given to the presence of a map-like structure showing the location of all retinal activity in the Lateral Geniculate nucleus?

Retinotopic mapping

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14

What is the term given to the LGN transmission of visual information to the opposite hemispheres that each eye occupy respectively?

Contra-lateral networks

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15

Why is it important that the visual networks of the brain are contra-lateral?

Aids with depth perception via ocular disparity

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16

Name the cortex that chooses and sorts information in the LGN for top down processing?

Visual

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17

What was the name of the two psychologists that proved the neural existence of receptive fields for object orientation in cats?

Hubel and Weisel

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18

What is the name of the complex receptive field that deals with object orientation?

V1

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19

Using on-centre receptive fields, describe a V1 field for representing vertical orientations?

On-center RF stacked on top of each other with peripheral areas overlapping

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20

What can complex cell networks (like V1) do that simple networks (on-center RF) cannot?

Movement detection

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21

What are the names of neurons that respond to corners of objects?

End-stopped cells

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22

What elements of vision do the V2, V3, V4 and V5 complex receptive fields represent?

Depth, Motion, colour and direction

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23

True or false, the primary visual cortex has specific areas for each Vx receptive field?

true

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24

What are the two neural networks found in the higher level of the visual cortex?

Dorsal and Ventral streams

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25

Which two other brain regions do the dorsal and ventral streams connect to?

dorsal is parietal and ventral is temporal

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26

What is another term for the Vx complex receptive fields?

Stimulus modality

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27

True or false: each Vx stimulus modality only executes the function it is related to (i.e. V5 only does direction)

False

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