The Pupillary Light Response Reflects Visual Working Memory Content

Cecilia Husta, Edwin Dalmaijer, Artem Belopolsky, Sebastiaan Mathot*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Recent studies have shown that the pupillary light response (PLR) is modulated by higher cognitive functions, presumably through activity in visual sensory brain areas. Here we use the PLR to test the involvement of sensory areas in visual working memory (VWM). In two experiments, participants memorized either bright or dark stimuli. We found that pupils were smaller when a prestimulus cue indicated that a bright stimulus should be memorized; this reflects a covert shift of attention during encoding of items into VWM. Crucially, we obtained the same result with a poststimulus cue, which shows that internal shifts of attention within VWM affect pupil size as well. Strikingly, the effect of VWM content on pupil size was most pronounced immediately after the poststimulus cue, and then dissipated. This suggests that a shift of attention within VWM momentarily activates an "active" memory representation, but that this representation quickly transforms into a "hidden" state that does not rely on sensory areas.

Original languageEnglish
Pages (from-to)1522-1528
Number of pages7
JournalJOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE
Volume45
Issue number11
DOIs
Publication statusPublished - Nov-2019

Keywords

  • pupillomeuy
  • pupil light response
  • visual working memory
  • EYE
  • MAINTENANCE
  • ATTENTION
  • MULTIPLE
  • STATES

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