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J Opt Soc Am A Opt Image Sci Vis. 2009 Jul;26(7):1553-63.

Influences of prolonged viewing of tilted lines on perceived line orientation: the normalization and tilt after-effect.

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Department of General Psychology, Vilnius University, Vilnius, Lithuania.


Gibson [J. Exp. Psychol. 16, 1 (1993)] observed that during prolonged viewing, a line perceptually rotates toward the nearest vertical or horizontal meridian (the normalization effect), and moreover, the perceived orientation of a subsequently presented line depends on the orientation of the adapting one (the tilt after-effect). The mechanisms of both phenomena remain poorly understood. According to our experimental results, the adapting line perceptually rotates to the nearest of three orientations: vertical, horizontal, and diagonal. We propose a simple neuronal model of orientation detectors whose responses are determined by the cardinal detectors. It is shown that both normalization and tilt after-effect may be explained by adaptation of these cardinal detectors.

[Indexed for MEDLINE]

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