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Published Online:https://doi.org/10.1176/ajp.108.12.912

The occurrence of 43 reports of auditory hallucinations were accompanied by 19 instances of muscle activity to a moderate to marked degree (grades 2 and 3). There were only 4 instances in which the activity was coincident with the report of a hallucination, as indicated in Table 1.[SEE SOURCE PDF FOR TABLE 1.] Although bursts of muscle activity are occasionally seen from muscles of vocalization coinciding with auditory hallucinations reported by psychotic patients, such hallucinations are not consistently accompanied by vocal myographic discharges.

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