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Definition
| The minimum magnitude of a stimulus that can be reliably discriminated from no substance at all. |
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| The minimum difference in stimulus magnitude necessary to tell two stimuli apart. |
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Definition
The intensity by which the standard must be increased to be noticed is proportional to the intensity of the standard.
(8% for light), 100 lit candles = +8 |
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| Just Noticeable difference (JND) |
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Definition
| Similar to difference threshold, where as the minimum magnitude needed in order to tell two stimuli apart. |
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Definition
| Based on the concept that the magnitude of a subjective sensation increases proportional to the logarithm of the stimulus intensity. JND? |
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Definition
| Tough white fibrous outer envelope of tissue covering all the eyeball except the cornea. |
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| The transparent convex portion of the outer fibrous coat of the eyeball that covers the iris and pupil. |
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| Biconvex transparent body situated behind the iris in the eye, it's role is to work with the cornea and focus light at the retina. |
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| The ability of the eye to bend light so that an image is focused on the retina. |
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| The process by which the lens of the eye varies its focus. |
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| The pigment sensitive to red light in the retinal rods of the eyes. Also called visual purple. |
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| An element of the Retina mediating achromatic sensation only. * Important for right, and peripheral vision. |
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| Specialized cells in the eye found predominantly in the Fovea and more sparsely throughout the Retina. |
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| A theory of color perception that postulates three basic color receptors, red, green, and blue. |
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Definition
Three Antagonistically organized systems.
red - green
blue - yellow
black - white |
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Definition
| A small area in the central retina packed with cones. it is the most sensitive part of the retina for detailed vision and color vision in daylight. |
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Definition
| The small circular optically insensitive region in the retina where fibers of the optic nerve emerge from the eyeball. |
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Definition
| A change in sensitivity following prolonged stimulation. |
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Definition
Closure
Similarity
Continuity
*TRICKS OF THE EYE |
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