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Related Experiment Videos

LATEST: A model of saccadic decisions in space and time.

Benjamin W Tatler1, James R Brockmole2, R H S Carpenter3

  • 1School of Psychology, University of Aberdeen.

Psychological Review
|March 31, 2017
PubMed
Summary

Understanding gaze control, this study introduces a unified model for deciding when and where to look. It reveals that eye movements are triggered when the benefits of a new visual location outweigh staying put.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Vision
  • Oculomotor Research

Background:

  • Directing gaze is crucial for visually guided actions, requiring decisions on timing and location.
  • Current models often separate spatial and temporal mechanisms for gaze control.
  • Understanding gaze strategies informs us about the brain's information sampling priorities.

Purpose of the Study:

  • To present a unified computational model for predicting both the timing and target of human gaze shifts.
  • To challenge the assumption that spatial and temporal gaze control mechanisms are distinct.

Main Methods:

  • Developed a novel model based on the principle of comparing expected benefits of moving versus staying.
  • Evaluated the model's ability to predict fixation selection and saccade timing.

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Main Results:

  • The model successfully accounts for both when eye movements occur and where they are directed.
  • Saccade timing analysis alone predicts fixation points in scene viewing.
  • The model performs comparably to or better than existing models of fixation selection.

Conclusions:

  • A single decision mechanism can explain both the timing and spatial selection of saccades.
  • Gaze control decisions are based on a cost-benefit analysis of shifting fixation.
  • This unified approach offers a more parsimonious explanation for oculomotor behavior.