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18 - Simultaneity versus asynchrony of visual motion and luminance changes

from Part III - Temporal phenomena: binding and asynchrony

Published online by Cambridge University Press:  05 October 2010

By
Martin J. M. Lankheet  and
Wim A. van de Grin
Edited by
Romi Nijhawan  and
Beena Khurana
Romi Nijhawan
Affiliation:
University of Sussex
Beena Khurana
Affiliation:
University of Sussex
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Summary

Summary

Much work has been described comparing relative timing of different features, mostly motion and color or motion and a flash. Here we study the timing relations of pairs of motion stimuli and pairs of motion and flicker or motion and flashes. In a two-alternative forced choice task we measured thresholds for detecting asynchrony, providing estimates for shifts in subjective simultaneity as well as the window of synchronicity.

Windows of synchronicity varied for different combinations of motion direction. Comparing different velocities or different contrast levels revealed large shifts in subjective synchronicity. Contrast effects were much larger for motion reversals than for luminance flicker, indicating a major influence on motion mechanisms. Our results are compatible with the hypothesis of a flexible, high-level brain program for timing analysis. Temporal resolution of this program is limited. Differences in the processing of separate motion characteristics should be taken into account in cross-feature comparisons involving visual motion information. Results for motion reversals versus luminance flashes did not reveal a clear differential shift in time. Large differences within the motion system and the lack of a differential latency between motion reversals and flashes suggest that the flash-lag effect may be largely caused by instant spatial remapping of positional information for moving objects. We show that spatial extrapolation does not necessarily result in overshoot errors when the motion stops.

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Space and Time in Perception and Action , pp. 301 - 318
Publisher: Cambridge University Press
Print publication year: 2010

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