Abstract
A comparison of the tilt aftereffect (TAE) and the simultaneous tilt illusion (TI) revealed very similar angular functions. When an aftereffect and a simultaneous illusion of opposite signs were paired by first adapting to a clockwise orientation and then presenting the vertical test line together with a counterclockwise inducing line, the two effects summed linearly. The results suggest a unitary mechanism of TAE and TI. and are consistent with the hypothesis that they are manifestations of lateral inhibition between orientation detectors.
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