Medical Glossary

This glossary contains:
19186
medical terms

Correspondence problem



Correspondence problem

In Stereopsis: the challenge of matching elements in one eye with elements in another eye. Also known as the Matching Problem. In Motion: the challenge of matching moving elements in one frame with elements in a succeeding frame (especially true of random dot cinematograms).

RELATED TERMS
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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.

Matching
See pairing.

Eye
The organ of sight. The eye has a number of components. These components include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous.



SIMILAR TERMS
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Corrections Deparment Institute
The Corrections Deparment Institute is a hospital in Camp Hill, Pennsylvania, United States.

Correlation
The relationship of one variable to another, not to be confused with causation.

Corrigan pulse
A pulse that is full and then suddenly collapses.

Corrugated
Having a ripple-like distortion.



PREVIOUS AND NEXT TERMS
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Complex cells
Cells in the primary visual cortex (V1) that responding either to an edge, a bar or a slit stimulus of a particular orientation falling anywhere in its receptive field. The exact location of the stimulus within the receptive field is not as critical. Have receptive fields longer than those of simple cells. The cell behaves non-linearly, responding to a drifting cosine grating with a uniform increase in activity with no sinusiodal modulcation (i.e. insensitive to phase). For a historical perspective see Simple Cells.

Concentric field
A receptive field divided into an inner circular region and an outer ring-shaped region. Light falling in each of the two regions has opposite effects on the response of the cell.

Cone opsin
Light absorbing molecule in cone cells.

Contrast sensitivity function
The reciprocal of the threshold contrast required to obtain a criterion response from a cell or a human subject as a function of spatial frequency. Falls off in sensitivity as the spatial frequency of the test pattern increases.

Coplanar ratio hyphothesis
An hypothesis by Gilchrist in which the visual system does not use retinal contrasts to determine relative lightnesses but uses depth information to determine which regions are at the same depth (coplanar) and uses their contrasts to deteremine the lightness perceived. This hypothesis has come under recent attack.

Correspondence problem

Corticaltectal pathway
Pathway from the cortex to the superior colliculi.

Cortical magnification factor
Defined as millimeters of cortex per degree of visual angle.

CPD
Cycles per degree of visual angle. The human limit is about 30cpd in the fovea for an individual with 20/20 vision.

Critical flicker frequency (CFF)
The frequency of flicker where the alternating levels of brightness are seen as a single level. The frequency is dependent on brightness levels and retinal location.

Cytochrome oxidase
Histochemical method. Indicator of functional state of neurons as brain derives energy from oxidase metabolism. Used in the discovery of blobs in the visual cortex.

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This dictionary contains 19186 terms.


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