Quiz 5.1

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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


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