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Pretectal area
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.
RELATED TERMS--------------------------------------
Superior
The anatomical term for "above". i.e. the head is superior to the shoulder. Typically used in humans only. See Cranial/Caudal/Inferior.
Accessory
Additional, extra, supplementary, subsidiary to the main thing. An accessory digestive organ is an organ that helps with digestion but is not part of the digestive tract. The accessory nerve is so-called because it receives an additional (accessory) root from the upper part of the spinal cord. An accessory placenta is an extra placenta separate from the main placenta.
Nucleus
Plural: nuclei. The compartment of a cell that contains the chromosomes.
SIMILAR TERMS--------------------------------------
Preterm labor
Labor that begins before the 37th week of pregnancy.
Pretoria Urology Hospital
The Pretoria Urology Hospital is a hospital in Pretoria, South Africa.
Pretoria-Oos Private Hospital
The Pretoria-Oos Private Hospital is a hospital in Pretoria, South Africa.
PREVIOUS AND NEXT TERMS--------------------------------------
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.
Prelunate cortex
Area V4 in rhesus monkey brain.
Pretectal area
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.
Prosopagnosia
A loss of the ability to identify members of complex categories such as faces.
Psychophysical function
A plot showing the variation in threshold (e.g. the dimmest light required for response) with some stimulus dimension (e.g. wavelength).
Posterior parietal cortex
Concerned with the perception of the spatial relations among objects.
Panniculitits
A rare, multifactorial inflammatory condition involving subcutaneous fat.
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