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Perceptual constancy
Perceptual constancy
The phenomenon that the perception of an object remains constant despite changes in the its size, lighting conditions and orientation.
SIMILAR TERMS--------------------------------------
Perceptive field
Area of the retina or visual space that when stimulated by a visual stimulus produces a change in behavioral response.
Perceptual image
An image in the mind as presently being perceived through one or more of the senses.
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.
Perchloracap
Perchloracap is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): potassium perchlorate.
Percocet
Percocet is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): acetaminophen; oxycodone hydrochloride.
Percodan
Percodan is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): aspirin; oxycodone hydrochloride; oxycodone terephthalate.
Percodan-demi
Percodan-demi is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): aspirin; oxycodone hydrochloride; oxycodone terephthalate.
Percorten
Percorten is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): desoxycorticosterone acetate.
Percutaneous
Passing through the skin.
Percutaneous transhepatic cholangiography
X-rays of the gallbladder and bile ducts; a dye is injected through the abdomen to make the organs show up on the x-ray.
Percutaneous transluminal coronary angioplasty (PTCA)
Angioplasty
Percutaneous umbilical cord sampling
A genetic test that screens blood from a fetus's umbilical cord for abnormalities.
Percy Junor Hospital
The Percy Junor Hospital is a hospital in Manchester, Jamaica.
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Parvocellular layer
4 superficial layers of the Lateral Geniculate Nucleus. Small neurons, termination sight of midget ganglion cells.
Palinopsia
Literally 'seeing again'; Is a form of visual perseveration. It refers to reappearance of an image after some time when the original external stimulus is no longer available. Neural basis of palinopsia is unknown but many palinopsia patients have some right-hemisphere disturbances.
Parvocellular pathway
Pathway that begins with the midget (parvo) ganglion cells in the retina and terminates within the parvocellular layer of the LGN. Conduction slower than that of Magnocellular Pathway.
Pattern adaptation
The perceived width and orientation of a grating pattern can be altered by first adapting to grating pattern of different frequencies and orientations. After adapting the contrast sensitivity to stimuli near the frequency or orientation of the adapting pattern is reduced. Suggests the existence of neurons tuned for frequency and orientation at are fatigued by the adapting pattern.
Perceptive field
Area of the retina or visual space that when stimulated by a visual stimulus produces a change in behavioral response.
Perceptual constancy
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
Cells lining the back of the eye containing melanin which resynthesize photopigment for photoreceptors.
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