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Orientation processing mechanisms revealed by the plaid tilt illusionThe tilt after-effect (TAE) and tilt illusion (TI) have revealed a great deal about the nature of orientation coding of 1-dimensional (1D) lines and gratings. Comparatively little research however has addressed the mechanisms responsible for encoding the orientation of 2-dimensional (2D) plaid stimuli. A multi-stage model of edge detection has recently been proposed [Georgeson, M. A. (1998) Image & Vision Computing, 16(6-7), 389-405] to account for the perceived structure of a plaid stimulus that incorporates extraction of the zero-crossings (ZCs) of the plaid. Data is presented showing that the ZCs of a plaid inducing stimulus can interact with vertical grating test stimulus to induce a standard tilt illusion. However, by considering the second-order structure of a plaid rather than ZCs, it was shown that the perceived orientation of the vertical test grating results from the combination of orientation illusions due to the first- and second-order components of an inducing plaid. The data suggest that the mechanisms encoding the orientation of second-order contours are similar to, and interact directly with, those that encode first-order contours.
Document ID
20040112595
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, S.
(NASA Ames Research Center Moffett Field CA United States)
Wenderoth, P.
van der Zwan, R.
Date Acquired
August 21, 2013
Publication Date
February 1, 2001
Publication Information
Publication: Vision research
Volume: 41
Issue: 4
ISSN: 0042-6989
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other

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