Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Ambiguous plaids: Switching between coherence and transparency

Ambiguous plaids: Switching between coherence and transparency Ambiguous plaids: Switching between coherence and transparency MICHAEL VON GRÜNAU AND STÉPHANE DUBÉ Department of Psychology, Concordia University, Montréal, Québec H3G 1M8, Canada Received 18 May 1992; revision accepted 6 October 1992 Abstract-A plaid pattern consisting of two differently oriented moving gratings can be seen as two alternative percepts: transparency, in which the two gratings are seen to slide over each other in their respective directions, or coherence, in which one integrated pattern (the plaid) is seen to move in a new direction. With prolonged inspection, an observer switches between these two alternatives. It was found here that adaptation to unambiguous coherence reduces the time that coherence is seen with an ambiguous test stimulus. Similarly, adaptation to transparency reduces the time transparency is seen. Analysis of the duration of consecutive episodes revealed that the underlying processes are adapted independently. Control experiments confirmed that adaptation occurred to the coherent plaid and not to the intersections, and that this adaptation was not simply a directional motion aftereffect. It is concluded that switching occurs between motion processes at different cortical levels that can be adapted independently. 1. INTRODUCTION The direction of motion of an extended grating behind a fixed-size aperture is http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

Ambiguous plaids: Switching between coherence and transparency

Loading next page...
 
/lp/brill/ambiguous-plaids-switching-between-coherence-and-transparency-0MW2SZPB8G

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Brill
Copyright
© 1993 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0169-1015
eISSN
1568-5683
DOI
10.1163/156856893X00360
Publisher site
See Article on Publisher Site

Abstract

Ambiguous plaids: Switching between coherence and transparency MICHAEL VON GRÜNAU AND STÉPHANE DUBÉ Department of Psychology, Concordia University, Montréal, Québec H3G 1M8, Canada Received 18 May 1992; revision accepted 6 October 1992 Abstract-A plaid pattern consisting of two differently oriented moving gratings can be seen as two alternative percepts: transparency, in which the two gratings are seen to slide over each other in their respective directions, or coherence, in which one integrated pattern (the plaid) is seen to move in a new direction. With prolonged inspection, an observer switches between these two alternatives. It was found here that adaptation to unambiguous coherence reduces the time that coherence is seen with an ambiguous test stimulus. Similarly, adaptation to transparency reduces the time transparency is seen. Analysis of the duration of consecutive episodes revealed that the underlying processes are adapted independently. Control experiments confirmed that adaptation occurred to the coherent plaid and not to the intersections, and that this adaptation was not simply a directional motion aftereffect. It is concluded that switching occurs between motion processes at different cortical levels that can be adapted independently. 1. INTRODUCTION The direction of motion of an extended grating behind a fixed-size aperture is

Journal

Spatial Vision (continued as Seeing & Perceiving from 2010)Brill

Published: Jan 1, 1993

There are no references for this article.