Palinopsia
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  Palinopsia



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.

RELATED TERMS
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Perseveration
Tendency to emit the same verbal or motor response again and again to varied stimuli.

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.



SIMILAR TERMS
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Pali doctors
All doctors near Pali, India. Doctors who can assist a patient in Pali.

Palindromic rheumatism
A condition characterised by episodic articular or periarticular pain, often with redness. The pain may be intense but rarely lasts longer than 2 or 3 days and resolves totally afterwards with no sequelae. May ultimately evolve into a more recognisable arthropathy (e.g. rheumatoid arthritis in a proportion of those with rheumatoid factor).



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Parvocellular layer
4 superficial layers of the Lateral Geniculate Nucleus. Small neurons, termination sight of midget ganglion cells.

Palinopsia

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
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.

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