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Related Experiment Video

Updated: Jan 19, 2026

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Comparing Pupil Light Response Modulation between Saccade Planning and Working Memory.

Chin-An Wang1, Jeff Huang1, Rachel Yep1

  • 1Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, CA.

Journal of Cognition
|September 14, 2019
PubMed
Summary
This summary is machine-generated.

Spatial attention mechanisms in saccade planning and working memory show similarities. Local pupil luminance responses can probe visuospatial processing, revealing nuanced attentional engagement in these cognitive tasks.

Keywords:
arousalattentionpupil constrictionpupil dilationsaccade preparation

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Spatial attention is crucial for both planning eye movements (saccades) and maintaining information in working memory.
  • Previous research links saccade planning and working memory to attention, but direct comparisons of their attentional effects are limited.
  • Spatial attention modulates responses to local luminance, causing pupil size changes even without global luminance shifts.

Purpose of the Study:

  • To directly compare the influence of saccade planning versus spatial working memory on attentional mechanisms.
  • To investigate the role of local luminance modulation in differentiating these two cognitive processes.
  • To assess the utility of pupil responses as a measure of visuospatial processing.

Main Methods:

  • Participants performed saccade planning (visual-delay) and spatial working memory (memory-delay) tasks.
  • During a variable delay period, bright and dark patches were presented peripherally.
  • Pupil size was measured to assess the local luminance modulation effect relative to target location.

Main Results:

  • Pupil constriction was greater for bright compared to dark patches when spatially aligned with the target in both tasks.
  • This local luminance modulation effect was reduced when patch and target locations lacked contingency, especially in the memory-delay task.
  • Results indicate overlapping yet distinct attentional mechanisms engaged by saccade planning and working memory.

Conclusions:

  • Saccade planning and spatial working memory involve similar, but not identical, attentional processes.
  • Local pupil luminance responses offer a sensitive method for investigating visuospatial processing.
  • The findings contribute to understanding the neural basis of attention and its modulation by visual stimuli.