Module 5.1 Quiz
Which receptors are responsible for the perception of color?
Cones only
The optic nerve is composed of axons from which kind of cell?
Ganglion cells
Which statement characterizes the fovea?
It has the greatest perception of detail
Why does the fovea provide the clearest, most detailed visual information?
It has tightly packed receptors
Which statement is TRUE with regard to peripheral vision?
It is easier to recognize single objects in the periphery that are not surrounded by other objects
Why do humans perceive faint light better in the periphery of the eye?
More receptors in the periphery than in the fovea funnel input to each ganglion cell
After you stare at a bright green object for a minute and look away, you see red. Which theory attempts to explain this finding?
Opponent-process theory
_____ modify the _____________ sensitivity to different wavelengths of light
Opsins; photopigments
_____________ are chemicals that release energy when struck by light
Photopigments
In what order does visual information pass through the retina?
Receptor cells, bipolar cells, ganglion cells
Light from the right half of the world strikes which part of the retina?
The left half
Light energy converts 11-cis-retinal to...
all-trans-retinal
In comparison to cones, rods...
are more sensitive to dim light
In the human retina, messages go from the receptors at the back of the eye to...
bipolar cells
The name of the point at which the optic nerve leaves the retina is called the _____ ____
blind spot
According the the retinex theory, we perceive color by...
contrasting the activity in one area of the visual field with that of the others
The law of specific nerve energies states that...
every stimulation of the optic nerve is perceived as light
Bipolar cells send their messages to ______ _____, which are located close to the center of the eye
ganglion cells
Bipolar cells send their messages to _______ _____, which are located close to the center of the eye
ganglion cells
The most common form of color vision deficiency is due to...
long and medium-wavelength cones making the same photopigment
According to the trichromatic theory of color vision...
our perception of color depends on relative activity of three types of cones
Chemicals that release energy when struck by light are called...
photopigments
Light enters the eye through an opening in the center of the iris called the...
pupil
Color constancy is the ability to...
recognize the color of an object despite changes in lighting
Difficulty distinguishing between ___ and _____ is the most common form of color vision deficiency
red; green
Color and brightness constancy are best explained by the _______ theory of color vision
retinex
In comparison to the rods, cones are more...
sensitive to detail
Rods are to ___ _________ as cones are to ___ _____
the periphery; the fovea
At the level of rods and cones, the ____________ theory seems to fit best, while at the level of the bipolar cells, the ________ _______ theory seems to fit best
trichromatic; opponent process
According to the law of specific nerve energies, the brain tells the difference between one sensory modality and another by...
which neurons are active