Retinal Mechanisms Flashcards

1
Q

Photopigment bleaching:

A

2 molecules combine to form photopigment: retinal and Olson combined molecule is called rhodopsin

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2
Q

What is photopic vision

A

Suited for high luminance

Low sensitivity/ high acuity

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3
Q

What is mesopic vision

A

Intermediate luminance and sensitivity/acuity

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4
Q

What is scotopic vision

A

Low light vision

High sensitivity/low acuity

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5
Q

Mechanisms of adaption to luminance

A

1.Pupil size
2.switch between rods and cones
3.dark adaptation: bleaching of photopigment
4.field adaptation: automatic gain control with photoreceptor

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6
Q

Rods versus cones:

A

1.Rod cells are more sensitive that cones, by 1 order of magnitude
2.a much bigger difference comes from convergence of rods onto ganglion cells

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7
Q

Info processing after the photoreceptor

A

Retinal processing partially reduces this to things of interest both spatial and temporal

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8
Q

Concept of receptive field

A

1.ganglion cell is the final output of the retina
2. Each ganglion cell may respond to many photoreceptors
3.shine a light on the retina to determine the ganglion receptive field

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