Extrinsic factors in the perception of bistable motion stimuli


Baker, Daniel H. and Graf, Erich W. (2010) Extrinsic factors in the perception of bistable motion stimuli Vision Research, 50, 9 pages. (doi:10.1016/j.visres.2010.04.016).

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Description/Abstract

When viewing a drifting plaid stimulus, perceived motion alternates over time between coherent pattern motion and a transparent impression of the two component gratings. It is known that changing the intrinsic attributes of such patterns (e.g. speed, orientation and spatial frequency of components) can influence percept predominance. Here, we investigate the contribution of extrinsic factors to perception; specifically contextual motion and eye movements. In the first experiment, the percept most similar to the speed and direction of surround motion increased in dominance, implying a tuned integration process. This shift primarily involved an increase in dominance durations of the consistent percept. The second
experiment measured eye movements under similar conditions. Saccades were not associated with
perceptual transitions, though blink rate increased around the time of a switch. This indicates that saccades
do not cause switches, yet saccades in a congruent direction might help to prolong a percept because (i) more saccades were directionally congruent with the currently reported percept than expected by chance, and (ii) when observers were asked to make deliberate eye movements along one motion axis, this increased percept reports in that direction. Overall, we find evidence that perception
of bistable motion can be modulated by information from spatially adjacent regions, and changes to the retinal image caused by blinks and saccades.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.visres.2010.04.016
ISSNs: 0042-6989 (print)
Keywords: bistable motion, saccade, contextual modulation, motion integration
ePrint ID: 154897
Date :
Date Event
2010Accepted/In Press
Date Deposited: 26 May 2010 13:48
Last Modified: 18 Apr 2017 04:05
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/154897

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