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Lateralized auditory processing in depression: dichotic click detection

G Bruder, S Sutton, P Berger-Gross

    Psychiatry Research
    |June 1, 1981
    PubMed
    Summary
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    Bipolar disorder patients show reversed brain lateral asymmetry, unlike unipolar depression patients. Symptom severity correlates with reduced asymmetry in depression.

    Area of Science:

    • Neuroscience
    • Psychiatry
    • Clinical Psychology

    Background:

    • Altered brain lateral asymmetry is observed in various psychiatric conditions.
    • Previous studies suggested lateral asymmetry differences in medicated affective psychotic patients.

    Purpose of the Study:

    • To investigate auditory processing and lateral asymmetry in unmedicated bipolar and unipolar depressed patients.
    • To explore the relationship between lateral asymmetry patterns and diagnostic subtypes and symptom severity.

    Main Methods:

    • Measured auditory detection thresholds for dichotic click stimuli in 14 bipolar depressed patients, 19 unipolar depressed patients, and 15 healthy controls.
    • Analyzed lateral asymmetry patterns in relation to diagnostic criteria (Research Diagnostic Criteria) and symptom ratings (Schedule for Affective Disorders and Schizophrenia).

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    Main Results:

    • Unmedicated bipolar depressed patients exhibited reversed lateral asymmetry, consistent with earlier findings in medicated patients.
    • Bipolar disorder patients were more prone to reversed lateral asymmetry compared to unipolar disorder patients.
    • Increased severity of depressive or endogenous symptoms correlated with diminished lateral asymmetry.

    Conclusions:

    • Lateral asymmetry patterns differ between bipolar and unipolar depression.
    • Symptom severity, particularly depressive and endogenous features, is associated with reduced brain lateral asymmetry in depression.