Abstract
Acuity for orientation and constant errors of perceived orientation of a short bright line were measured by psycho-physical techniques. Large constant errors were found which varied systematically according to the orientation and exposure duration of the line. The results were interpreted in terms of units that respond selectively to lines at particular orientations, such that: (1) Most units have inputs from both eyes (2) Units are most selective when ‘tuned’ to the horizontal or vertical directions (3) Units integrate their outputs by a process of mutual inhibition (4) Long term adaptation distributes perceived contour orientation uniformly around the clock.
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