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Intensity?
Amount of energy in light waves-determined by a wave’s amplitude, or height
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Pupil?
Adjustable opening in the center of the eye through which light enters
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Iris?
Right of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
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Lens?
Transparent structure behind the pupil that changes shape to help focus images on the retina
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Retina?
Multilayered tissue on the eyeball’s sensitive inner surface
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Accommodation?
Process by which the eye’s lens changes shape to focus near or far objects on the retina
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Rods \ Cones?
Retinal receptor cells, rods: see gray, black, white, and twilight vision (peripheral) when codes don’t respond, cones: detect fine detail and give rise to color
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Optic nerve?
Nerve that carries neural impulses from the eye to the brain
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Blind spot?
Point at which the optic nerve leaves the eye, creating a “blind” spot because no receptor cells are located there
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Fovea?
Central focal point in the retina, around which the eye’s cones cluster
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Feature detectors?
Nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement
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Parallel processing?
Doing many things at once
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Young-Helmholtz dichromatic (three color) Theory?
Theory that the retina contains 3 different color receptors
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Opponent process theory?
Theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision
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