Discriminating between anticipatory and visually triggered saccades: measuring minimal visual saccadic response time using luminance

Journal of Neurophysiology
Jessica HeemanJan Theeuwes

Abstract

We describe a novel behavioral method to accurately discriminate anticipatory (i.e., saccades not generated by visual input) from visually triggered saccades and to identify the minimal visual saccadic reaction time (SRT). This method can be used to calculate a feasible lower bound cutoff for latencies of visually triggered saccades within a certain experimental context or participant group. We apply this method to compute the minimal visual SRT for two different saccade target luminance levels. Three main findings are presented: 1) the minimal visual SRT for all participants was 46 ms shorter for bright targets than for dim targets, 2) the transition from non-visually triggered to visually triggered saccades occurred abruptly, independent of target luminance, and 3) although the absolute minimal visual SRTs varied between participants, the response pattern (response to bright targets being faster than to dim targets) was consistent across participants. These results are consistent with variability in saccadic and neural responses to luminance as has been reported in monkeys. On the basis of these results, we argue that differences in the minimal visual SRT can easily occur when stimuli vary in luminance or other saliency featu...Continue Reading

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Citations

Dec 1, 2020·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Shin-Ichi TokushigeYasuo Terao
Nov 6, 2021·Journal of Vision·Dirk van Moorselaar, Jan Theeuwes

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