November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Effects of orientation adaptation on motion perception
Author Affiliations
  • Corrado Caudek
    University of Trieste, Italy
  • Fulvio Domini
    Brown University, USA
Journal of Vision November 2002, Vol.2, 653. doi:10.1167/2.7.653
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      Corrado Caudek, Fulvio Domini; Effects of orientation adaptation on motion perception. Journal of Vision 2002;2(7):653. doi: 10.1167/2.7.653.

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Abstract

Purpose. In a previous investigation, we found that attention directed to a stationary Gabor patch in the center of the visual field can bias the perceived direction of plaid motion in the periphery (Caudek & Domini, 2001). Consistently with the interpretation that has been provided to those previous results, here we tested the following related hypothesis: Adaptation to a stationary Gabor patch affects differently subsequent motion sensitivity in the parallel or orthogonal directions relative to the Gabor's orientation. Methods. In each trial, observers underwent adaptation (4 s) to a 0°, 45° or 315° oriented Gabor patch. Immediately after adaptation, a stochastic motion stimulus (Williams & Sekuler, 1984) was presented for 140 ms. In half of the trials a proportion of dots (i.e., ‘signal’ dots) moved in a coherent direction whereas each of the remaining (‘noise’) dots moved in a random direction. In the other half of the trials all dots were noise dots. Coherent motion was simulated in the 45°, 135°, 225°, 315° directions. The task was to discriminate between noise and signal-plus-noise trials. Results. Consistently with our hypothesis, motion sensitivity differed in the orthogonal and parallel directions relative to the Gabor orientation. In particular, we found a lower motion sensitivity in the direction parallel to the Gabor orientation. Conclusions. The present results indicate that adaptation to a stationary stimulus can subsequently affect motion perception, and are consistent with the feature similarity model of Treue and Trujillo (1999).

Caudek, C., Domini, F.(2002). Effects of orientation adaptation on motion perception [Abstract]. Journal of Vision, 2( 7): 653, 653a, http://journalofvision.org/2/7/653/, doi:10.1167/2.7.653. [CrossRef] [PubMed]
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