Color- and Edge-Sensitive Channels in the Human Visual System: Tuning for Orientation

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Science  15 Oct 1971:
Vol. 174, Issue 4006, pp. 314-316
DOI: 10.1126/science.174.4006.314


After subjects scanned red stripes tilted clockwise off vertical and green stripes tilted equally but counterclockwise, vertical test stripes appeared tilted counterclockwise when red but clockwise when green. As the angle between scanned and test stripes was increased from 0° to 75°, the magnitude of the tilt aftereffect rapidly increased to a peak between 10° and 15° and then dropped close to zero at about 40°, a result consistent with narrowly tuned edge-sensitive channels.