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Self-consistent estimation of mislocated fixations during reading.

Ralf Engbert1, Antje Nuthmann

  • 1Department of Psychology, University of Potsdam, Potsdam, Germany. Ralf.Engbert@uni-potsdam.de

Plos One
|February 7, 2008
PubMed
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Reading eye movements often mislocate fixations on words due to oculomotor errors. This study introduces a new method to estimate these mislocated fixations, finding they affect 10-30% of fixations based on word length.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Computational Linguistics

Background:

  • Saccadic eye movements are crucial for reading, directing words to the fovea for processing.
  • Oculomotor system errors lead to broad distributions of fixation landing positions within words.
  • This suggests a significant proportion of fixations may land on unintended words.

Purpose of the Study:

  • To develop a novel procedure for self-consistent estimation of mislocated fixations during normal reading.
  • To quantify the likelihood of oculomotor errors affecting word targeting in reading.

Main Methods:

  • Iterative computation of oculomotor error proportions.
  • Estimation of underlying word-targeting probabilities.
  • Correction of landing position distributions based on error likelihood.

Related Experiment Videos

Main Results:

  • The average fraction of mislocated fixations varies between 10% and over 30%.
  • Mislocated fixation frequency is dependent on word length.
  • Oculomotor errors significantly influence fixation probabilities.

Conclusions:

  • A substantial percentage of fixations are mislocated due to oculomotor errors.
  • The proposed method provides a reliable estimation of mislocated fixation likelihood.
  • Understanding these errors is key to comprehending reading dynamics.