The University of Southampton
University of Southampton Institutional Repository

Extrinsic factors in the perception of bistable motion stimuli

Record type: Article

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.

PDF archiveversion.pdf - Author's Original
Restricted to Repository staff only
Download (4MB)


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).

More information

Accepted/In Press date: 2010
Keywords: bistable motion, saccade, contextual modulation, motion integration


Local EPrints ID: 154897
ISSN: 0042-6989
PURE UUID: aaeccfff-6bf1-4cda-a6c9-76a299ea4a7a
ORCID for Erich W. Graf: ORCID iD

Catalogue record

Date deposited: 26 May 2010 13:48
Last modified: 18 Jul 2017 12:45

Export record



Author: Daniel H. Baker
Author: Erich W. Graf ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.