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Dorsal pathway
Dorsal pathway One of two theorized systems of visual information processing. Information thought to progress toward the parietal cortex V1-> V2 -> MT -> MST -> STP. Functions in comprehension of spatial arrangement.
RELATED TERMS--------------------------------------
Cortex
The outer layer of the cerebrum, densely packed with nerve cells.
SIMILAR TERMS--------------------------------------
Dorsal
Toward the back.
Dorsum
The back or posterior side of a structure. "Dorsum" is the Latin word for the back. Something pertaining to the dorsum is dorsal. The dorsal surface of the hand is the back of the hand, the side opposite the palm. The dorsal surface of the foot is the back of the foot, the side opposite the sole. The dorsal vertebrae are the thoracic vertebrae; they form part of the back. The dorsal roots of the spinal nerves are the back roots, the posterior roots.
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Dichromatic color vision
Color vision based on two cone photoreceptor pigments in the retina.
Diffraction
The scattering of rays of light by collision with particles of matter as they pass through a medium such as air or water, or pass by a edge or narrow aperture. Plays a role when the pupil is small.
Direction selectivity
A difference in the response of a cell to a pattern of light moving through it receptive field according to the direction of movement. Cells respond well when a stimulus moves in one direction and not in the opposite direction.
Discounting the illuminant
Illumination of the visual world tens to be non-uniform, and fluctuates. in order for the visual system to create a consistent perception of color and lightness it must somehow discount fluctuation and gradient in the lighting source.
Disparity gradient
The ratio of the difference between two feature's disparities and their cyclopean separation. Steeply slanted surfaces have large disparity gradients. Human binocular fusion will only tolerate a disparity gradient of about 1.
Dorsal pathway
Derma
Skin.
Diffuse
Not definitely localized or limited; spread widely through a tissue or substance.
Diphtheritic membrane
A thin coating on the surface of an epithelial lined organ (e.g. intestine) that is composed of necrotic cellular debris, inflammatory cells and fibrin.
Dysgenesis
Defective embryonic development.
Dystopia
Displacement.
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