Quiz 10-B

To see a distant dim star, it is best to look _______ of your visual field.

slightly off center

Inhibitors of the neurotransmitter _______ cause the pupil of the eye to _______.

ACh; dilate

The primary visual cortex is in your frontal lobe.

False

What term is used to describe the point in the retina where there the cones are tightly packed and there is the greatest visual acuity? There may be more than one correct answer.

Fovea

Which of the following is incorrectly paired?

Horizontal cells; action potentials

Which of the following represents the route by which visual information is transmitted?

Optic nerve → optic tract → optic radiations

Which statement about rod receptors is false?

Rods contain a special photopigment called S opsin.

Which statement regarding visual fields is true?

The right visual field projects to the eyes and then to the left cerebral hemisphere.

__________ is to hearing as __________ is to vision.

Tonotopy: retinotopy

The primary visual cortex is also known as:

V1.

The photoreceptors that are most sensitive to colors are ______.

cones

Which of the following is the correct order of neuron layers in the retina from outermost to innermost?

ganglion cell layer, bipolar cell layer, photoreceptor layer

Receptor cells and bipolar cells release the neurotransmitter

glutamate.

When light hits the center of an off-center bipolar cell's receptive field, it _______ and releases _______ glutamate, which in turn _______ off-center ganglion cells.

hyperpolarizes; less; hyperpolarizes

The _____ is the primary visual relay nucleus in the thalamus.

lateral geniculate nucleus

The process that enhances the boundaries of visual objects is called

lateral inhibition.

In the visual cortex, the fovea has:

more representation on the cortex than the periphery even though it has fewer cells in the retina.

In the optic chiasm, information from the _____ retinas crosses to the opposite side, whereas information from the _____ retinas stays on the same side.

nasal; temporal

The point at which two optic nerves meet and half of the fibers cross to the opposite side is the

optic chiasm.

Once the nerve bundles of the eyes enter the brain and have been sorted into two visual fields they are referred to as

optic tracts.

The optic chiasm

provides each hemisphere with visual information.

Ocular dominance columns

receive input from each eye.

What type of map is associated with the visual system?

retinotopy

Quanta of light that enter the eye are captured in rod cells by

rhodopsin

An object located in your left visual field will be processed in your

right hemisphere.

An on-center/off-surround cell responds most strongly when

the entire center is illuminated.

Photoreceptors are mostly densely packed in

the fovea.

The optic chiasm is the point at which

the two optic nerves meet and half of the fibers cross over.

Relative to the actual image being viewed, the image reflected on the retina of the eye is

upside down and reversed.

Lateral inhibition is a phenomenon

whereby contrast is produced at the edges of regions.