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The interaction between orientation and motion signals in moving oriented Glass patterns

Published online by Cambridge University Press:  31 July 2017

ANDREA PAVAN ,
LUCY M. BIMSON ,
MARTIN G. GALL ,
FILIPPO GHIN  and
GEORGE MATHER
ANDREA PAVAN*
Affiliation:
School of Psychology, University of Lincoln, Lincoln LN5 7AY, UK
LUCY M. BIMSON
Affiliation:
School of Psychology, University of Lincoln, Lincoln LN5 7AY, UK
MARTIN G. GALL
Affiliation:
School of Psychology, University of Lincoln, Lincoln LN5 7AY, UK
FILIPPO GHIN
Affiliation:
School of Psychology, University of Lincoln, Lincoln LN5 7AY, UK
GEORGE MATHER
Affiliation:
School of Psychology, University of Lincoln, Lincoln LN5 7AY, UK
*
*Address correspondence to: Andrea Pavan, University of Lincoln, Brayford Pool, Lincoln, Lincolnshire LN6 7TS, UK. E-mail: apavan@lincoln.ac.uk
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Abstract

Previous psychophysical evidence suggests that motion and orientation processing systems interact asymmetrically in the human visual system, with orientation information having a stronger influence on the perceived motion direction than vice versa. To investigate the mechanisms underlying this motion-form interaction we used moving and oriented Glass patterns (GPs), which consist of randomly distributed dot pairs (dipoles) that induce the percept of an oriented texture. In Experiment 1 we varied the angle between dipole orientation and motion direction (conflict angle). In separate sessions participants either judged the orientation or motion direction of the GP. In addition, the spatiotemporal characteristics of dipole motion were manipulated as a way to limit (Experiment 1) or favor (Experiment 2) the availability of orientation signals from motion (motion streaks). The results of Experiment 1 showed that apparent GP motion direction is attracted toward dipole orientation, and apparent GP orientation is repulsed from GP motion. The results of Experiment 2 showed stronger repulsion effects when judging the GP orientation, but stronger motion streaks from the GP motion can dominate over the signals provided by conflicting dipole orientation. These results are consistent with the proposal that two separate mechanisms contribute to our perception of stimuli which contain conflicting orientation and motion information: (i) perceived GP motion is mediated by spatial motion-direction sensors, in which signals from motion sensors are combined with excitatory input from orientation-tuned sensors tuned to orientations parallel to the axis of GP motion, (ii) perceived GP orientation is mediated by orientation-tuned sensors which mutually inhibit each other. The two mechanisms are revealed by the different effects of conflict angle and dipole lifetime on perceived orientation and motion direction.

Keywords

Moving Glass patternsOriented Glass patternsMotion-form interactionSpatial motion-direction sensorMotion streaks
Type
Research Article
Information
Visual Neuroscience , Volume 34 , 2017 , E010
Copyright
Copyright © Cambridge University Press 2017 

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