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The author investigated the subclinical tremor on the extremity muscles in stutterers at rest, without speaking. This tremor occurred in the native EMG record from the musculus abductor digiti quinti during isometric contraction. Because it occurred in a muscle not involved in speaking and moreover at rest, without speaking, the author excludes the possibility that it could be an increase in the amplitude of physiological tremor; she concludes that the cause of this tremor are changes in the function of the structures responsible for motor feedback, especially in the extrapyramidal and cerebellar field.