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For a specific type of sensory input is the minimum stimulus intensity that an organism can detect.
Just Noticeable Difference (JND)
The smallest difference in stimulus intensity that a specific sense can detect.
States that the size of a just noticeable difference is a constant proportion of the size of the initial stimulus.
Proposes that the detection of stimuli involves decision processes as well as sensory processes, which are both influenced by a variety of factors besides stimulus intensity.
The opening in the center of the iris that permits light to pass into the rear chamber of the eye.
The neural tissue lining the inside back surface of the eye; it absorbs light , processes images, and sends visual information to the brain.
A tiny spot in the center of the retina that contains only cones; visual acuilty is greatest at this spot.
Receptive Field Of A Visual Cell
The retinal area that, when stimulated, affects the firing of that cell.
The point at which the optic nerve from the inside half of each eye cross over and project to the opposite half of the brain.
Involves simultaneously extracting different kinds of information from the same input.
Neurons that respond selectively to very specific features of more complex stimuli.
Subtractive Colour Mixing
Removing some wavelengths of light, leaving less light than was originally there.
Trichromatic Theory of Colour Vision
That the human eye has three types of receptors with differing sensitives to different light wavelengths.
Additive Colour Mixing
superimposing lights, putting more light in the mixture than exists in any one light by itself.
Opponent Process Theory of Colour Vision
Colour perception depends on receptors that make antagonistic responses to three pairs of colours.
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