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Related Experiment Video

Updated: Jul 20, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

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Published on: March 18, 2019

An internal clock generates repetitive predictive saccades.

Wilsaan M Joiner1, Mark Shelhamer

  • 1Department of Biomedical Engineering, The Johns Hopkins University, School of Medicine, 720 Rutland Avenue/606 Traylor Bldg, Baltimore, MD 21205, USA. wjoiner@bme.jhu.edu

Experimental Brain Research
|September 12, 2006
PubMed
Summary

Researchers found that predictive eye tracking relies on an internal clock, not just reactive responses. This internal clock mechanism for eye movements is accurate and flexible, even when stimulus timing changes.

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Area of Science:

  • Neuroscience
  • Oculomotor Control
  • Behavioral Science

Background:

  • Prior research suggests an "internal clock" mechanism for interval timing in repetitive movements.
  • A behavioral phase transition exists between reactive and predictive eye tracking of alternating targets.

Purpose of the Study:

  • To investigate if predictive oculomotor (saccade) tracking utilizes an internal time reference (clock).
  • To examine the impact of transient perturbations on predictive tracking to validate the internal clock hypothesis.

Main Methods:

  • Subjects performed predictive eye tracking of alternating targets with periodic pacing stimuli.
  • Transient perturbations were introduced: altering inter-stimulus intervals or removing targets.
  • Reactive and predictive tracking responses were analyzed during these perturbations.

Main Results:

  • Predictive tracking maintained its pre-existing rate despite stimulus timing perturbations, unlike reactive tracking.
  • Predictive tracking exhibited Weber's Law and scalar property, consistent with clock models, which reactive tracking did not.
  • An internal representation of target pacing (internal clock) was established rapidly, within two eye-movement intervals.

Conclusions:

  • Findings support the presence of an internal clock for generating predictive eye movements.
  • The neural mechanism for predictive tracking is temporally accurate and flexible.
  • The internal clock mechanism is relevant for real-world situations due to its rapid adaptation.