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Orientation columns
Orientation columns The primary visual cortex (V1) is organized into narrow columns (from pial surface to white matter) containing cells with almost identically the same orientation preferences.
RELATED TERMS--------------------------------------
Cortex
The outer layer of the cerebrum, densely packed with nerve cells.
Orientation
Awareness of one's self in relation to time, place, and person.
SIMILAR TERMS--------------------------------------
Orientation
Awareness of one's self in relation to time, place, and person.
PREVIOUS AND NEXT TERMS--------------------------------------
Optic tract
Retinal fibers leaving the optic chiasm separated by visual hemi-field (i.e. not by eye). Projects to three areas, the pretectum, the superior colliculus and the LGN.
Optical power (of a lens)
Measure of how strongly a lens bends incoming rays. Measured in diopters and equal to the reciprocal of focal length. Human eye has an optical power of about 58.8 diopters.
Optokinetic reflex
Elicited by coherent movement of a large region of the visual field. Helps stabilize the visual scene on the retina.
Optokinetic nystagmus
Eye movements characterized by a series of smooth movements in the same direction of a moving visual scence interspersed with rapid movements in the opposite direction.
Optomotor response
The turning response of an animal presented with uniform flow of optic texture in the direction which minimizes rate of flow relative to the animal.
Orientation columns
Oreintation selectivity
Cells which have oriented receptive fields, responding more for some orientations than others.
Outer segment
Portion of the photoreceptor cell that contains photopigment.
Oligochromemia
Deficiency of hemoglobin in the blood.
Osteoma
Tumor of bone.
Osteomyelitis
Inflammation of bone.
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