Lecture 12: Retinal Processing Retinal Output

What is the potential of the Center PR cell when the light is OFF?

Depolarized

Inhibition by HC

What is the potential of ON-Center BP when light is OFF?

Intermediatee

Hyperpolarized

RG Cells when light is OFF?

Spontaneous and with activity

What is the potential of Center PR cells when CENTER is bright?

Hyperpolarized by light 

Inhibition by HC 

What is the potential of ON-Center BP cells when CENTER is bright?

Maximally Depolarized

What is the change in action potential of RG cells when CENTER is bright?

Large INCREASE in Action Potential

What is the potential of Center PR cells when SURROUNDING is bright?

Depolarized by light 

NO additional inhibition 

What is the potential of ON-Center BP cells when SURROUNDING is bright?

Maximally Hyperpolarized

What is the effect on the action potential when RG cells when the SURROUNDING is bright?

Large DECREASE of Action Potential

What is the potential of Center PR cells when EVERYTHING is bright?

Hyperpolarized by light 

NO additional inhibition 

What is the potential of ON-Center BP cells when EVERYTHING is bright?

Intermediate

Hyperolarized 

What is the potential of RG cells when EVERYTHING is bright?

Spoontaneuous activity

Does Visual perception depend on illumination level?

NO it does not

What is important about contrast?

It is more informative than the overall illumination, so our perceptions is not dramatically affected by the level of ambient illumination

How can a signal travel from the retina? 

All of the above 

Which letters can you read?

left eye blindness

B

C

D

E

F

Which letters can you read?

loss of the lateral visual field of both eyes

B

C

D

E

Which letters can you read?

½ of visual field will be lost in both eyes

A

B

C