A New Perspective on Apraxia Based on Clinical Experience: Considering the Role of the Right Cerebral Hemisphere in Praxis

Funayama M and Mohamed N

Published on: 2024-02-15

Abstract

The conventional theory of apraxia has primarily focused on the left hemisphere since Liepmann’s initial model. However, the role of the right hemisphere has not been given sufficient attention. Specifically, the involvement of the right hemisphere in praxis may be crucial for apraxia rehabilitation. Despite a lack of high-quality research clarifying its effective approach, considering the role of the right hemisphere in rehabilitation settings might prove beneficial.

Here, we propose a supplementary role of the right hemisphere and its corresponding auxiliary function of the left-hand during praxis, especially in tool use. Traditional examinations of apraxia have mainly focused on the activities of the dominant hand, namely the right hand, clarifying the role of the left hemisphere. For instance, when assessing the tool-use action of cutting paper with scissors, evaluations have been conducted through pantomime or the actual use of the tool, observing the subject's ability to correctly handle and manipulate the scissors with the right hand. However, everyday actions typically require the involvement of both hands. Moreover, in clinical settings, instances of inadequate auxiliary use of the left hand are not uncommonly observed in patients with apraxia.