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Perceived duration of brief visual events is mediated by timing mechanisms at the global stages of visual processing

Beattie, L and Curran, W and Benton, CP and Harris, JM and Hibbard, PB (2017) 'Perceived duration of brief visual events is mediated by timing mechanisms at the global stages of visual processing.' Royal Society Open Science, 4. ISSN 2054-5703

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There is a growing body of evidence pointing to the existence of modality-specific timing mechanisms for encoding sub- second durations. For example, the duration compression effect describes how prior adaptation to a dynamic visual stimulus results in participants underestimating the duration of a sub- second test stimulus when it is presented at the adapted location. There is substantial evidence for the existence of both cortical and pre-cortical visual timing mechanisms; however, little is known about where in the processing hierarchy the cortical mechanisms are likely to be located. We carried out a series of experiments to determine whether or not timing mechanisms are to be found at the global processing level. We had participants adapt to random dot patterns that varied in their motion coherence, thus allowing us to probe the visual system at the level of motion integration. Our first experiment revealed a positive linear relationship between the motion coherence level of the adaptor stimulus and duration compression magnitude. However, increasing the motion coherence level in a stimulus also results in an increase in global speed. To test whether duration compression effects were driven by global speed or global motion, we repeated the experiment, but kept global speed fixed while varying motion coherence levels. The duration compression persisted, but the linear relationship with motion coherence was absent, suggesting that the effect was driven by adapting global speed mechanisms. Our results support previous claims that visual timing mechanisms persist at the level of global processing.

Item Type: Article
Uncontrolled Keywords: adaptation; motion processing; time perception
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Paul Hibbard
Date Deposited: 06 Mar 2017 12:32
Last Modified: 21 Sep 2018 10:15

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