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Interaction between first- and second-order orientation channels revealed by the tilt illusion: psychophysics and computational modelling

Citation

Smith, ST and Clifford, CWG and Wenderoth, P, Interaction between first- and second-order orientation channels revealed by the tilt illusion: psychophysics and computational modelling, Vision Research: An International Journal for Functional Aspects of Vision, 42, (8) pp. 1057-1071. ISSN 0042-6989 (2001) [Refereed Article]

DOI: doi:10.1016/S0042-6989(01)00015-3

Abstract

This paper examines the interaction between first- and second-order contours in the orientation domain. Using the simultaneous tilt illusion (TI), we show that the apparent rotation of a vertical test grating away from that of a surrounding inducing grating (repulsion effect) occurs when both the inducing and test grating are either first- or second-order. Furthermore, a significant repulsion effect is obtained when a first-order inducing grating surrounds a second-order test. If lateral inhibitory interactions between populations of orientation selective neurons provides a plausible explanation for orientation repulsion effects [Blakemore, C. B. Carpenter, R. H. S. & Georgeson, M. A. (1970) Nature, 228, 37-39], it is likely that the cue-invariant mechanisms that encodes the orientation of first- and second-order contours also exhibit inhibitory interactions. A two-channel computational model of orientation encoding is presented where one channel encodes only first-order stimuli while the second channel encodes both first- and second-order contours. In addition to predicting the orientation repulsion effects we observed, the model also provides a functional account of orientation attraction effects in terms of the responses of populations of orientation-tuned neurons.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Neurosciences
Research Field:Sensory Systems
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Hearing, Vision, Speech and Their Disorders
Author:Smith, ST (Associate Professor Stuart Smith)
ID Code:85645
Year Published:2001
Web of Science® Times Cited:19
Deposited By:Health Sciences A
Deposited On:2013-07-26
Last Modified:2013-07-26
Downloads:0

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