Quiz 5.2
____ respond to a particular feature of a stimulus
Feature detectors
____ cells axons make up the optic nerve.
Ganglion
Cortical area ____ appears to be where conscious visual perception occurs
V1
Infants with cataracts need to have surgical repair ____.
as early as possible
Astigmatism refers to the
asymmetric curvature of eyes
In foveal vision
each ganglion cell is excited by a single cone
In the vertebrate retina, which cells are responsible for lateral inhibition?
horizontal cells
Branches of the optic nerve go directly to what areas of the brain?
lateral geniculate and superior colliculus
Cutting the left optic nerve in front of the optic chiasm would result in blindness in the
left eye
The ability to detect movement better than color in our peripheral vision is largely due to
magnocellular neurons in the periphery
Axons from the lateral geniculate extend to which area of the cerebral cortex?
occipital lobe
The optic nerves from the right and left eye initially meet at the ____.
optic chiasm
Being able to detect fine details of a color painting would depend most on which type of ganglion cells?
parvocellular
V1 neurons would be most strongly activated by viewing
repeating stripes on a flag
In depth perception, different views are received by each eye, depending on the distance of the object being viewed. What is this called?
retinal disparity
Stereoscopic depth perception requires the brain to detect
retinal disparity
In the visual system, the ____ and ____ constantly feed information back and forth.
thalamus; cortex
The primary visual cortex sends its information
to area V2
What is strabismus?
a failure of the two eyes to focus on the same thing at the same time
What is the shape of the receptive field to which a simple cell in the primary visual cortex responds?
bar in a particular orientation
The one additional feature that hypercomplex cells have that complex cells do not is that hypercomplex cells
have a strong inhibitory area at one end of its receptive field
What is responsible for sharpening contrast at visual borders?
lateral inhibition
The receptive field of a receptor is the
point in space from which light strikes the receptor
The ____ of any neuron in the visual system is the area of the visual field that excites or inhibits it
receptive field
The lateral geniculate nucleus is part of the
thalamus
What would be the likely outcome of a person who was blind at birth, and had vision restored later in life by the removal of cataracts (clouded lenses)?
trouble describing the shapes of objects