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Saccadic instabilities and voluntary saccadic behaviour.

E Gowen1, R V Abadi

  • 1Behavioural Brain Sciences, School of Psychology, Hills Building, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. e.gowen@bham.ac.uk

Experimental Brain Research
|March 9, 2005
PubMed
Summary
This summary is machine-generated.

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Saccadic intrusions (SI) are involuntary eye movements. This study found no link between SI frequency and voluntary saccade behavior, suggesting attention influences fixation rather than saccade system deficits.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Science

Background:

  • Primary gaze fixation is unstable, prone to involuntary saccadic intrusions (SI).
  • SI are common in the general population, characterized by rapid eye movements away from fixation, followed by a corrective saccade or drift.
  • These intrusions typically have small amplitudes (<1 degree) and can show directional biases.

Purpose of the Study:

  • To investigate the underlying causes of saccadic intrusions (SI) by examining their relationship with saccadic behavior.
  • To test the hypothesis that SI result from deficits in the saccadic system, specifically reduced inhibitory mechanisms.
  • To determine if voluntary saccade behavior changes correlate with SI frequency and directional biases.

Main Methods:

  • Ten healthy subjects performed various oculomotor tasks: synchrony (no gap), gap, overlap, and antisaccade.

Related Experiment Videos

  • Voluntary saccade behavior was assessed, including saccade latencies, express saccades, and antisaccade errors.
  • Correlations between SI frequency/directionality and saccade parameters were analyzed.

    • Main Results:

    • No significant correlations were found between SI frequency and voluntary saccade latencies, express saccade percentages, or antisaccade error percentages.
    • No significant correlations emerged between SI directional biases and directional biases in saccade latency, express saccades, or antisaccade errors.
    • These findings indicate that altered saccadic system function is unlikely to cause SI.

    Conclusions:

    • Saccadic intrusions (SI) do not appear to stem from underlying deficits in the saccadic system.
    • The generation of SI may be influenced by attentional mechanisms acting on an intact saccadic system.
    • Descending corticofugal signals related to attention and orientation might modulate the balance between fixation and saccade generation, thereby influencing SI characteristics.