EEGs of the close relatives of patients and normal volunteers with the mu rhythm were investigated. EEGs were recorded from 14 families which included 12 fathers, 14 mothers and 9 siblings. In nine families, at least one nonproband family member had the mu rhythm. The mu rhythm was found in 13 (37.1%) of the 35 relatives. This incidence is much higher than that in a general population. These data suggest that the mu rhythm is genetically determined in most cases. The mode of inheritance might be autosomal dominant.
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