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Direction selectivity
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.
RELATED TERMS--------------------------------------
Cell
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.
SIMILAR TERMS--------------------------------------
Direct-entry midwife
A midwife who has entered the profession of midwifery as an apprentice to a practicing midwife rather than attending a formal school program.
Directed DNA sequencing
Successively sequencing DNA from adjacent stretches of a chromosome.
Directives, advance
Known also as advance medical directives, these are documents that pertain to treatment preferences and the designation of a surrogate decision-maker in the event that a person should become unable to make medical decisions on their own behalf. Advance directives generally fall into three categories: living will, power of attorney and health care proxy.
Directives, advance medical
These documents pertain to treatment preferences and the designation of a surrogate decision-maker in the event that a person should become unable to make medical decisions on their own behalf. Advance directives generally fall into three categories: living will, power of attorney and health care proxy.
Diredawa doctors
All doctors near Diredawa, Ethiopia. Doctors who can assist a patient in Diredawa.
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Depth capture
Objects in an image with no apparent depth information can be captured by surrounding surfaces which do contain depth information.
Diaplopia
Double vision.
Dichoptic stimulation
When different images are presented to each eye.
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
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
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.
Derma
Skin.
Diffuse
Not definitely localized or limited; spread widely through a tissue or substance.
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