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Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading
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Eye movements and display change detection during reading.

Timothy J Slattery1, Bernhard Angele, Keith Rayner

  • 1Department of Psychology, University of California, San Diego, La Jolla, CA 92093, USA. tslattery@ucsd.edu

Journal of Experimental Psychology. Human Perception and Performance
|June 22, 2011
PubMed
Summary

Readers are often unaware of visual changes during reading due to saccadic suppression. However, display change detection depends on eye movement timing and the nature of the change, influencing reading processing.

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Area of Science:

  • Cognitive Psychology
  • Experimental Psychology
  • Visual Perception

Background:

  • The boundary change paradigm describes how preview words are replaced by target words during reading.
  • Saccadic suppression typically prevents readers from noticing these word changes.
  • Individual differences exist in the ability to detect such display changes.

Purpose of the Study:

  • To investigate display change detection using eye movement data and signal detection analyses.
  • To examine the influence of letter identity versus case changes on detection.
  • To understand how timing and eye position affect change awareness.

Main Methods:

  • Two experiments were conducted combining eye tracking with signal detection tasks.
  • Participants read sentences and reported any perceived display changes.
  • Display changes were introduced either immediately during saccades or with a slight delay.

Main Results:

  • Change detection was higher for letter changes than case changes in the immediate condition.
  • In the delayed condition, detection rates were equal for letter and case changes.
  • Sensitivity to changes correlated with eye position relative to the preview and change timing.

Conclusions:

  • Word processing relies on abstract, case-independent letter identities.
  • The timing of display changes relative to eye movements significantly impacts detection.
  • Reader sensitivity to visual changes is influenced by both perceptual and attentional factors.