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Orientation processing mechanisms revealed by the plaid tilt illusion


Smith, ST and Wenderoth, P and van der Zwan, R, Orientation processing mechanisms revealed by the plaid tilt illusion, Vision Research: An International Journal for Functional Aspects of Vision, 41, (4) pp. 493-504. ISSN 0042-6989 (2001) [Refereed Article]

DOI: doi:10.1016/S0042-6989(00)00268-6


The 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.

Item Details

Item Type:Refereed Article
Keywords:Plaid tilt illusion; Orientation coding; First-order; Second-order
Research Division:Biomedical and Clinical Sciences
Research Group:Neurosciences
Research Field:Sensory systems
Objective Division:Health
Objective Group:Other health
Objective Field:Other health not elsewhere classified
UTAS Author:Smith, ST (Associate Professor Stuart Smith)
ID Code:85646
Year Published:2001
Web of Science® Times Cited:3
Deposited By:Health Sciences A
Deposited On:2013-07-26
Last Modified:2013-07-26

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