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

Stuart T Smith; Colin W G Clifford; Peter Wenderoth

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

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

Journal article

Peer reviewed

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

Stuart T Smith, Colin W G Clifford and Peter Wenderoth

Vision Research, Vol.41(8), pp.1057-1071

2001

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

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Abstract

Medical and Health Sciences

Psychology and Cognitive Sciences

tilt illusion

orientation coding

first-order

second-order interaction

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.

Details

Title: Interaction between first- and second-order orientation channels revealed by the tilt illusion: psychophysics and computational modelling
Authors: Stuart T Smith (Author) - Macquarie University
Colin W G Clifford (Author) - Macquarie University
Peter Wenderoth (Author) - Macquarie University
Publication details: Vision Research, Vol.41(8), pp.1057-1071
Publisher: Pergamon
Date published: 2001
DOI: 10.1016/S0042-6989(01)00015-3
ISSN: 0042-6989
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449349602621
Output Type: Journal article

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Web Of Science research areas: Neurosciences; Ophthalmology; Psychology