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Striate Cortex

  1. Margaret T. T. Wong-Riley

Published Online: 30 JAN 2010

DOI: 10.1002/9780470479216.corpsy0949

Corsini Encyclopedia of Psychology

Corsini Encyclopedia of Psychology

How to Cite

Wong-Riley, M. T. T. 2010. Striate Cortex. Corsini Encyclopedia of Psychology. 1–3.

Author Information

  1. Medical College of Wisconsin

Publication History

  1. Published Online: 30 JAN 2010

Abstract

The striate cortex, also known as the primary visual cortex, area 17, or V1, is involved in conscious visual perception. It is located in the occipital pole of the cerebral cortex, where much of it is deep within the calcarine fissure. There is a precise, retinotopic representation of the contralateral visual field in each hemisphere. The vertical meridian is represented at the border between V1 and V2 (the secondary visual cortex), and the horizontal meridian bisects it midway. The contralateral lower and upper visual fields are represented in the cuneus and lingual gyrus, respectively. The map is skewed because a much larger proportion of the striate cortex is devoted to the processing of the central visual field than to the periphery. The magnification therefore changes from about 4 mm of cortex per degree of visual field to about 0.5 mm/degree as the representation moves from 1° to 25° away from the center of gaze. In humans, approximately 53% of striate cortex is devoted to the representation of the central 15° of the visual field.

Keywords:

  • interpuffs;
  • koniocellular;
  • ocular dominance columns;
  • plasticity;
  • puffs