Visual System

Which cells in the retina are responsible for converting light into electrical

signals?

• Photoreceptors

• Bipolar Cells

• Ganglion Cells

• Pigmented Epithelium

How many types of cone photopigments are there in humans?

• 1

• 2

• 3

• 4

What is the light-absorbing photopigment found in rod cells?

• Melanopsin

• Photopsin

• Retinopsin

• Rhodopsin

What is a receptive field in the visual system?

• The entire surface of the retina where light is detected

• The circular area of visual space that influences a single ganglion cell’s activity

• The area of the brain that processes visual information

• The lens of the eye that focuses light onto the retina

An "on-center, off-surround" receptive field responds BEST when:

• A small spot of light is placed at the center

• A small spot of light is placed at the surround

• The entire center is illuminated and the surround remains dark

• Both center and surround are equally illuminated

What type of synapse between the photoreceptor and bipolar cell is involved in

generating an "off-center" response?

• Inhibitory

• Excitatory

• Both inhibitory and excitatory

• These cells do not synapse with each other