Pupil response hazard rates predict perceived gaze durations

Binetti, Nicola and Harrison, Charlotte and Mareschal, Isabelle and Johnston, Alan (2017) Pupil response hazard rates predict perceived gaze durations. Scientific Reports, 7 (1). p. 3969. ISSN 2045-2322

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Abstract

We investigated the mechanisms for evaluating perceived gaze-shift duration. Timing relies on the accumulation of endogenous physiological signals. Here we focused on arousal, measured through pupil dilation, as a candidate timing signal. Participants timed gaze-shifts performed by face stimuli in a Standard/Probe comparison task. Pupil responses were binned according to “Longer/Shorter” judgements in trials where Standard and Probe were identical. This ensured that pupil responses reflected endogenous arousal fluctuations opposed to differences in stimulus content. We found that pupil hazard rates predicted the classification of sub-second intervals (steeper dilation =“Longer” classifications). This shows that the accumulation of endogenous arousal signals informs gaze-shift timing judgements. We also found that participants relied exclusively on the 2nd stimulus to perform the classification, providing insights into timing strategies under conditions of maximum uncertainty. We observed no dissociation in pupil responses when timing equivalent neutral spatial displacements, indicating that a stimulus-dependent timer exploits arousal to time gaze-shifts.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Psychology
Identification Number: 10.1038/s41598-017-04249-9
Depositing User: Eprints, Support
Date Deposited: 29 Jun 2017 13:07
Last Modified: 12 Oct 2017 23:52
URI: http://eprints.nottingham.ac.uk/id/eprint/43883

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