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Related Experiment Videos

Control of fixation duration in a simple search task

I T Hooge1, C J Erkelens

  • 1Helmholtz Institute, Utrecht University, The Netherlands. i.hooge@fys.ruu.nl

Perception & Psychophysics
|October 1, 1996
PubMed
Summary

Fixation duration in visual search is controlled indirectly. Search difficulty influences how long we look at targets, with shorter fixations occurring when difficulty varies per trial.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Understanding the control mechanisms of fixation duration is crucial for visual search.
  • Previous models suggest direct control, but empirical evidence is debated.
  • Systematic variation of target discriminability offers a novel approach to study fixation control.

Purpose of the Study:

  • To investigate the influence of target discriminability on fixation duration during visual search.
  • To compare fixation duration control under blocked versus mixed discriminability conditions.
  • To test the validity of preprogramming models for fixation duration control.

Main Methods:

  • Four subjects performed simple visual search tasks.
  • Target discriminability was systematically varied under blocked (constant per session) and mixed (per trial) conditions.
  • Fixation durations were recorded and analyzed in relation to target discriminability and search strategy.

Main Results:

  • Under blocked conditions, fixation duration increased as target discriminability decreased.
  • In mixed conditions, difficult trials showed significantly shorter fixation durations compared to difficult trials in blocked conditions for two subjects.
  • A notable percentage of correct trials (5%-55%) involved fixating the target, searching further, and returning to the target, indicating non-immediate use of foveal information.

Conclusions:

  • Fixation duration control in simple visual search appears to be indirect, supporting preprogramming models.
  • The experimental design effectively modulated fixation duration based on discriminability.
  • Search behavior, including re-fixation, suggests complex decision-making processes beyond immediate visual input.

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