[Automatic-voluntary dissociation in apraxia].

Abstract

Automatic-voluntary dissociation in apraxia was discussed and the following two points were noted 1) This phenomenon is observed for praxis with procedural memory, i.e., learned or skilled movements such as brushing teeth and dressing, but not observed for praxis without procedural memory such as tasks used for testing constructional apraxia. 2) This phenomenon may be understood by dual motor act systems, i.e. implicit and explicit motor systems. Presumably, the former is mainly mediated by medial premotor system that involitionally drives motor procedural memory, while the latter is mainly mediated dorsolateral premotor system that volitionally drives motor procedural memory.