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Smooth pursuit pattern in schizophrenic patients during cognitive task

R Tomer, M Mintz, A Levy

    Biological Psychiatry
    |February 1, 1981
    PubMed
    Summary
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    Schizophrenic patients showed impaired saccadic pursuit, especially during cognitive tasks. Leftward tracking deficits suggest left hemispheric hyperactivity, potentially indicating a high-risk group for schizophrenia.

    Area of Science:

    • Neuroscience
    • Psychiatry
    • Cognitive Psychology

    Background:

    • Saccadic pursuit eye movements are crucial for visual tracking.
    • Previous research suggests potential eye movement abnormalities in schizophrenia.
    • Lateral eye movements (LEM) can indicate hemispheric dominance.

    Purpose of the Study:

    • To investigate saccadic pursuit asymmetries in schizophrenic patients.
    • To examine the impact of concurrent cognitive tasks on eye tracking performance.
    • To explore the relationship between LEM patterns, hemispheric function, and saccadic pursuit.

    Main Methods:

    • Electrooculography (EOG) was used to record eye movements.
    • 20 schizophrenic patients and two groups of normal subjects participated.

    Related Experiment Videos

  • Subjects performed saccadic pursuit tasks, with and without a cognitive load (syllogism solving).

    • Main Results:

    • Schizophrenic patients exhibited saccadic pursuit, but no initial left-right asymmetry was found.
    • Cognitive task performance significantly worsened tracking in patients, with more saccades/arrests during leftward pursuit.
    • A subgroup of controls, presumed left-hemisphere dominant, showed similar leftward tracking asymmetry under cognitive load.

    Conclusions:

    • Findings support the hypothesis of left hemispheric hyperactivity in schizophrenia.
    • Impaired saccadic pursuit during cognitive tasks highlights executive function deficits.
    • Specific saccadic pursuit patterns in controls may identify individuals at high risk for schizophrenia.