17 terms

psych sensation part 2

the clear tissue that covers the front of the eye
the adjustable opening in the center of the eye through which light enters
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
the transparent structure behind the pupil that changes shape to help focus images on the retina
the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information
retinal receptor cells that are concentrated near the center of the retina and that function in daylight of well-lit conditions. These detect fine detail and give rise to color sensations
the central point of the retina, around which the eye's cones cluster
bipolar cells
specialized cells which connect rods and cones to the ganglion cells of the optic nerve
ganglion cells
the specialized cells which lie behind the bipolar cells whose axons form the optic nerve which takes the information to the brain
optic nerve
the nerve that carries neural impulses from the eye to the brain
feature detectors
nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle or movement
trichromatic theory
visual theory that all colors can be made by mixing the three basic colors: red, green, and blue
images that occur when a visual sensation persists for a brief time even after the original stimulus is removed
color blindness
a variety of disorders marked by inability to distinguish some or all colors
opponent- process theory
the theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision.
blind spot
the point at which the optic nerve leaves the eye- no receptor cells are located here
retinal receptors that detect black, white and gray; necessary for peripheral vision and twilight vision, when cones don't respond