Wk 3 SP Flashcards

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1
Q

ratio of ganglion cells to photoreceptors

A

1:126

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2
Q

During single cell recording measuring ganglion response, Before anything is put on the screen, the ganglion cell is already..

A

active, i.e there is baseline activity

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3
Q

A (ganglion cell) cells receptive field is the area

what are the two regions in this area, what do they do

A

area on the retina which, when stimulated by light, elicits a change in the firing rate of the cell.

Excitatory,
inhibitory response -decrease in firing response

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4
Q

two types of centre-surround antagonism (ganglion cells)

A

ON-centre OFF-surround (central photoreceptor = excitatory of ganglion cell, Surrounding = inhibitory)

OFF-centre ON-surround (opposite)

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5
Q

Why have this centre-surround antagonism (ganglion cells) organisation?

A

Ganglion cells respond to changes in light falling within receptive field
(e.g. if there is an area of dark and area of light indicating a boundary/edge)
Ideal for detecting spots of light & edges
NOT able to detect orientation of bars
No response to changes in overall level of illumination

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6
Q

Ganglion cells reduce the amount of information in a stimulus by finding

A

contours and boundaries

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7
Q

A

A

A

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