ch 5 pt 1
Night-active species are more likely than day-active species to have ____.
a greater rod to cone ratio
Professor Walker is lecturing about the law of specific nerve energies. She would not tell the class that _____.
although found in different places, the same kind of receptors on neurons are able to detect light and sound.
Various types of ____ cells refine the input to ganglion cells, enabling them to respond specifically to shapes,movement, or other visual features.
amacrine cells
Which receptors are responsible for the perception of color?
cones only
The retinas of predatory birds such as hawks ____.
have a greater density of receptors than do humans on the top half of the retina
Why does the fovea provide the clearest, most detailed visual information?
it has tightly packed receptors
Professor Hancock is giving a lecture about peripheral vision. Which is the most likely to say?
it is easier to recognize single objects in the periphery that are not surrounded by other objects
____ modify the ____ sensitivity to different wavelengths of light.
opsins; photopigments
According to the Young-Helmholtz theory, what is the basis for color vision?
three kinds of cones
In vertebrate retinas, receptors send their messages ____.
to bipolar cells within the retina
In the back of each of Teresita's eyes, the axons of her ganglion cells all leave in one large bundle called the ______. As a result, this causes her to experience a _____.
optic nerve; blind spot
According to the trichromatic theory of color vision ____.
our perception of color depends on the relative activity of three types of cones
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
Corrie is studying for a quiz on the rods and cones. She writes in her notes that _____ are more ______.
rods; sensitive to light
Light has entered Joelle's eyes. After being detected by the photoreceptors, the information will be passed on to_____ cells.
bipolar cells
Meagan is studying for a quiz on the rods and cones. She writes in her notes that _____ are more ______.
cones; sensitive to detail
If you want to see something in fine detail, you should focus the light on which part of your retina?
fovea
The optic nerve is composed of axons from which kind of cell?
ganglion cells
Why do humans perceive faint light better in the periphery of the eye?
more receptors
____ are chemicals that release energy when struck by light.
photopigments
In order to be able to see things in her periphery, Pauline's _____ need to be activated
rods
Rods are to ____ as cones are to ____. the periphery; the fovea
the periphery; the fovea
According to the law of specific nerve energies, the brain tells the difference between one sensory modality andanother by ____.
which neurons are active
