Fatigue and Arousal Modulations Revealed by Saccade and Pupil Dynamics

Jui Tai Chen, Ying Chun Kuo, Tzu Yu Hsu, Chin An Wang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Saccadic eye movements are directed to the objects of interests and enable high-resolution visual images in the exploration of the visual world. There is a trial-to-trial variation in saccade dynamics even in a simple task, possibly attributed to arousal fluctuations. Previous studies have showed that an increase of fatigue level over time, also known as time-on-task, can be revealed by saccade peak velocity. In addition, pupil size, controlled by the autonomic nervous system, has long been used as an arousal index. However, limited research has been done with regards to the relation between pupil size and saccade behavior in the context of trial-to-trial variation. To investigate fatigue and arousal effects on saccadic and pupillary responses, we used bright and emotional stimuli to evoke pupillary responses in tasks requiring reactive and voluntary saccade generation. Decreased voluntary saccade peak velocities, reduced tonic pupil size and phasic pupillary responses were observed as time-on-task increased. Moreover, tonic pupil size affected saccade latency and dynamics, with steeper saccade main sequence slope as tonic pupil size increased. In summary, saccade dynamics and tonic pupil size were sensitive to fatigue and arousal level, together providing valuable information for the understanding of human behavior.

Original languageEnglish
Article number9234
JournalInternational Journal of Environmental Research and Public Health
Volume19
Issue number15
DOIs
StatePublished - Aug 2022

Keywords

  • arousal
  • pupil dilation
  • pupil light reflex
  • saccade peak velocity
  • superior colliculus
  • time-on-task
  • trial-to-trial
  • voluntary and reflexive saccades

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