Quiz 5.1
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.
____ are chemicals that release energy when struck by light.
Photopigments
In comparison to cones, rods
are more sensitive to dim light
In the human retina, messages go from receptors at the back of the eye to
bipolar cells
The law of specific nerve energies states that
every stimulation of the optic nerve is perceived as light
The optic nerve is composed of axons from which kind of cell?
ganglion cells
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
Chemicals that release energy when struck by light are called
photopigments
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
In what order does visual information pass through the retina?
receptor cells, bipolar cells, ganglion cells
Difficulty distinguishing between ____ and ____ is the most common form of color vision deficiency.
red; green
According to the trichromatic theory of color vision, the most important factor in determining the color we see is the
relative activity of short, medium, and long wavelengths
Light from the right half of the world strikes which part of the retina?
the left half
Rods are to ____ as cones are to ____
the periphery; the fovea
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.
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.
The name of the point at which the optic nerve leaves the retina is called the
blind spot
Which receptors are responsible for the perception of color?
cones only
According to the retinex theory, we perceive color by
contrasting the activity in one area of the visual field with that of the others
According to the trichromatic theory of color vision
our perception of color depends on the relative activity of three types of cones
Color constancy is the ability to
recognize the color of an object despite changes in lighting
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
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
