Abstract
The incidence and nature of intentional perseveration in buccofacial apraxia were investigated. Out of 30 left-hemisphere damaged patients perseverative errors in sequential oral movements were found in 10 cases of 17 buccofacial apraxia. The perseverative errors were classified into two types ; immediate and delayed type according to temporal relation of a response to the stimuli. In addition we divided buccofacial apraxia into two groups, that is, buccofacial apraxia with non-fluent aphasia and that with fluent aphasia. We could not find the differences of the nature of perseveration in two groups. And there were no correlations between verbal perseveration and oral perseveration. On CT findings the lesion of frontal lobe, temporal lobe, insula and parietal lobe were detected. Without frontal lobe lesions the oral perseveration were observed. Oral perseveration was supposed to be related with the disinhibition of the motor memory trace.
