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Pigment epithelium
Pigment epithelium Cells lining the back of the eye containing melanin which resynthesize photopigment for photoreceptors.
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Melanin
Black pigment in the pigment epithelium cells that absorbs light not captured by the retina preventing it from being reflected off the back of the eye.
SIMILAR TERMS--------------------------------------
Pigmented villonodular synovitis
PVNS. Rare, benign but sometimes locally destructive tumour of synovium. Much haemosiderin is present and haemarthroses may occur.
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Perceptual constancy
The phenomenon that the perception of an object remains constant despite changes in the its size, lighting conditions and orientation.
Perceptually lossless compression
An image processing technique with loses some information about contents of the image, but the distortions produced by the loss aren't visible to the human image processing system.
Peri-Stimulus time histogram
Plot of the average number of action potentials at each moment in time following a brief test flash.
Photopic
Bright light conditions where only the cones are functional.
Photoreceptor mosaic
The spacial arrangement of photoreceptors in the retina.
Pigment epithelium
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
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.
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.
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