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Related Experiment Videos

EEG alpha rhythm, intention and oculomotor control.

G M Loze1, D Collins, J C Shaw

  • 1Department of Physical Education, Sport and Leisure Studies, Moray House Institute of Education, The University of Edinburgh, UK. gavinl@mhie.ac.uk

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|September 17, 1999
PubMed
Summary

This study replicated Wertheim's (1981) visual pursuit tracking research. Higher posterior electroencephalogram (EEG) alpha power was observed during predictable tracking, supporting attention models.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Visual pursuit tracking involves maintaining focus on a moving target.
  • Electroencephalogram (EEG) alpha rhythm is associated with attention and cognitive states.
  • Wertheim's (1981) study explored EEG alpha during visual tracking.

Purpose of the Study:

  • To replicate Wertheim's (1981) visual pursuit tracking study.
  • To examine the reactivity of the posterior EEG alpha rhythm during predictable and unpredictable tracking tasks.
  • To investigate the implications for attention and intention models.

Main Methods:

  • Twelve subjects performed visual pursuit tracking of a light spot.
  • Tracking paths were either predictable or unpredictable.

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  • EEG was recorded from posterior scalp sites (O1, O2, P3, P4, T5, T6) referenced to linked mastoids.
  • Alpha frequency band power was calculated for 60-second epochs.

    • Main Results:

    • Significantly higher occipital and posterior temporal alpha power occurred during predictable tracking trials.
    • Findings were consistent with Wertheim's (1981) original results.
    • This suggests differential neural processing based on task predictability.

    Conclusions:

    • Posterior EEG alpha rhythm is modulated by the predictability of visual tracking tasks.
    • Increased alpha power during predictable tracking may reflect reduced attentional demands or a different attentional state.
    • Results support and extend Wertheim's attention/intention model of visual pursuit.