Flashcard Set Preview
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| 1 |
absolute threshold
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the smallest intensity of a stimulus that has to be present for the stimulus to be detected....
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rhodopsin
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A pigment in the eye that is necessary for vision. Retinal, derived from vitamin A, is used...
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difference threshold
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the minimum difference in stimulation that a person can detect 50% of the time. We experience...
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rods
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The rods are the receptors in the eye which detect movement. Rods are also used in night vision.
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cones
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cones r receptor cells that help us see fine details of things & help us see in situations...
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Weber fraction
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value that indicates the rel. btwn the intensity of a standard stimulus & the intensity of...
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just noticable difference (jnd)
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The minimum amount of difference between two sensory stimuli that a given individual can detect...
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trichromatic theory
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primary colors, which can combine additively to form all other colors; various photoreceptive...
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Fechner's Law
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S = K log I, where S is the magnitude of sensation elicited by a stimulus, I is the physical...
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opponent-process theory
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three opposing processes in human vision, two of which contrast each of two colors with another...
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sclera
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outter coat of the eyeball
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fovea
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central region of the retina. It is a small indentation about 0.3 mm across, subtending a visual...
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cornea
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The clear dome-shaped window that forms a specialized region of the sclera. light passes &...
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optic disk
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Region of the retina where the optic nerve fibres leave the eye. no visual response when light...
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lens
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A curved interior structure in the eye, which refracts light makes fine adjustments in the...
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adaptation
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A temporary physiological response to a sensed change in environment (e.g., see dark adaptation,...
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refraction
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The degree to which light waves are bent, usually by curvature of the surface of the medium...
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Gestalt principles
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bringing unconscious feelings to awareness "getting in touch w oneself" in order to help people...
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accommodation
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The process by which curvature of the lens changes in order to focus on objects at different...
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hi
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