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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Fixation positions after skipping saccades: a single space makes a large difference.

André Krügel1, Françoise Vitu, Ralf Engbert

  • 1Department Psychologie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, Potsdam, OT Golm, Germany. kruegel@uni-potsdam.de

Attention, Perception & Psychophysics
|September 22, 2012
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Summary

Skipped words during reading shift eye fixation positions leftward due to subtle visual cues, not just distance. This visuomotor phenomenon impacts saccade planning models.

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Area of Science:

  • Cognitive Science
  • Neuroscience
  • Ophthalmology

Background:

  • Saccadic eye movements are crucial for word processing during reading.
  • Previous research indicated skipped words shift fixation positions leftward.
  • The underlying mechanisms for this effect remained unclear.

Purpose of the Study:

  • To investigate the role of low-level visual information in skipped-word effects on fixation positions.
  • To determine if the skipped-word effect is a general visuomotor phenomenon.
  • To challenge existing models of saccade planning in reading.

Main Methods:

  • Controlled single-saccade experiments using "x" letter strings.
  • Analysis of fixation position distributions after skipped character strings.
  • Comparison of findings with the range-error model.

Main Results:

  • Subtle differences in pre-saccadic visual information significantly influence within-word fixation positions after skipped words.
  • The skipped-word effect was reproduced in a controlled single-saccade task.
  • Findings suggest the effect is a general visuomotor response.

Conclusions:

  • The skipped-word effect in reading is rooted in low-level visual processing, not solely word distance.
  • This phenomenon extends beyond the range-error model's predictions.
  • Results provide crucial data for developing visuomotor models of saccade planning during reading.