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Vocal activity in verbal hallucinations.

J Junginger, F P Rauscher

    Journal of Psychiatric Research
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Increased vocal potentials in psychiatric patients experiencing hallucinations were not significant when nonvocal measures were included. Subvocal speech was not detected, but vocal potentials correlated with hallucination location.

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    Area of Science:

    • Neuroscience
    • Psychiatry
    • Clinical Psychology

    Background:

    • Auditory hallucinations are a common symptom in psychiatric disorders.
    • Previous research suggested increased vocal electromyography (EMG) in individuals experiencing hallucinations.

    Purpose of the Study:

    • To investigate the relationship between vocal and nonvocal physiological measures and auditory hallucinations.
    • To determine if subvocal speech accompanies hallucinations.

    Main Methods:

    • Recorded vocal and forearm electromyography (EMG) in hallucinating and nonhallucinating psychiatric inpatients.
    • Utilized a microphone to detect subvocal speech and assessed responses to pre-recorded statements.
    • Collected subjective reports on hallucination frequency and phenomenology.

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    Main Results:

    • Replicated findings of increased vocal potentials in hallucinators, but this became nonsignificant when nonvocal measures were analyzed.
    • No evidence of subvocal speech or coincident increases in vocal EMG with hallucination reports.
    • A significant negative correlation was observed between mean vocal potential and the perceived location of hallucinations.

    Conclusions:

    • The presence of increased vocal potentials in hallucinators may be artifactual or dependent on measurement methods.
    • Subvocal speech is unlikely to be a primary mechanism underlying auditory hallucinations in this cohort.
    • Hallucination phenomenology, specifically perceived location, is related to vocal motor activity.