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Pool hypothesis
Pool hypothesis Hypothesis for the mechanism for stereopsis. Suggests the visual system contains three pools, one for crossed disparities, one for uncrossed disparities and one for non-zero disparities. A particular depth is signaled by the relative activity of crossed and uncrossed pools rather than by a sharply tuned neuron coding a particular depth.
RELATED TERMS--------------------------------------
Mechanism
The arrangement or association of the elements or parts of anything in relation to the effect they generate; the combination of mental processes by which an effect is generated.
Stereopsis
Also known as depth perception. The separation between the eyes provides for slightly different views of an object by each eye. The brain for the purpose of telling the location of an object in 3D space uses this difference in views between the eyes or disparity.
Neuron
A cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another.
SIMILAR TERMS--------------------------------------
Poole doctors
All doctors near Poole, Great Britain. Doctors who can assist a patient in Poole.
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Photopic
Bright light conditions where only the cones are functional.
Photoreceptor mosaic
The spacial arrangement of photoreceptors in the retina.
Pigment epithelium
Cells lining the back of the eye containing melanin which resynthesize photopigment for photoreceptors.
Pointspread
A measure of optical blur produced by natural imperfections of the lens of the eye. The response to a point of light produces a certain amount of blur, the amount of this blurring is known as the pointspread.
Poles (of optic flow field)
The two points in the optic flow field surrounding an observer moving through the environment at which there is no flow of optic texture. One is the point toward which the observer is moving and the other is the point away from which the observer is moving.
Pool hypothesis
Pop-Out
Target items in a visual search that have features which allow them to be detected quickly regarless of the nummber of distractors presents are said to "pop-out".
Post stimulus time histogram
A method for examining cell response to a particular stimulus. The time after stimulus onset is divided into a number of bins. The stimulus is then presented repeatedly and the count in each bin increased each time the cell fires during that time bin.
Prelunate cortex
Area V4 in rhesus monkey brain.
Pretectal area
Midbrain area just rostral to the superior colliculus. Receives input from the optic tract. Projects bilaterally to the preganglionic parasympathetic neurons of the accessory oculomotor nucleus. Mediates pupillary light reflexes.
Principle of univariance
The absorbtion of a long wavelength (low frequency, low energy) quantum has the same effect on a receptor as the absorbtion of a short wavelength (high frequency, high energy) quantum. It is the probability of absorption that changes photoreceptor sensitivity.
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