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The adaptive global effect: Luminance contrast modulates the global effect zone.

Jessica Heeman1, Jan Theeuwes2, Stefan Van der Stigchel3

  • 1Faculty of Social and Behavioral Sciences, Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands; Faculty of Behavioral and Movement Sciences, Department of Cognitive Psychology, Vrije Universiteit, Amsterdam, The Netherlands.

Vision Research
|July 10, 2024
PubMed
Summary

The saccade averaging zone expands when a distractor is more luminous than the target, demonstrating its adaptive nature. This zone also increases with higher luminance and shorter saccadic response times.

Keywords:
DistractorsGlobal effectLuminanceOculomotor captureRemote distractor effectSaccade averaging

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Area of Science:

  • Neuroscience
  • Vision Science
  • Oculomotor Research

Background:

  • Saccadic eye movements exhibit a 'global effect' or 'saccade averaging' when objects are near.
  • This averaging phenomenon diminishes with increased object separation.
  • The adaptability of the saccade averaging zone to object features remains largely unexplored.

Purpose of the Study:

  • To investigate if the saccade averaging zone adapts to variations in object luminance contrast.
  • To determine the influence of relative and absolute luminance on the averaging zone size.

Main Methods:

  • Two experiments involving saccadic eye movements were conducted.
  • Observers' saccades were recorded while target and distractor luminance varied.
  • The size of the saccade averaging zone was systematically assessed under different luminance conditions.

Main Results:

  • A larger averaging zone was observed when the distractor had higher luminance relative to the target.
  • Saccade averaging persisted even with remote distractors.
  • Equiluminant targets and distractors showed no change in the averaging zone with absolute luminance.
  • Increased relative and absolute luminance enlarged the averaging zone, particularly with shorter saccadic response times.

Conclusions:

  • The saccade averaging zone is adaptive to luminance contrast.
  • The size of the averaging zone increases with higher relative luminance and shorter saccadic response times.
  • Luminance contrast plays a crucial role in modulating oculomotor averaging behavior.