期刊
BRAIN AND COGNITION
卷 65, 期 2, 页码 169-176出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bandc.2007.07.010
关键词
apraxia; brain lesion; ecological condition; gestures; automatic/voluntary dissociation
The ability of apraxic patients to perform gestures in everyday life is a controversial issue. In this paper, we aimed to evaluate the automatic/voluntary dissociation (AVD) in four patients affected by clinically relevant limb apraxia. For this purpose, we sampled different kinds of gestures belonging to patients' motor repertoire and then assessed their production in a testing session. Our experimental procedure consisted of two steps: in the first phase, we recorded gestures produced by patients in two natural conditions; in the second phase, we assessed production of correctly produced tool-actions, and of spontaneous non tool-actions and meaningless conversational (cohesive and beats) gestures under different modalities. AVD was observed for all types of gestures, albeit to different degree in single patients. The present findings demonstrate that the context provides strong bottom-up cues for the retrieval of motor patterns, while artificial testing conditions impose an additional cognitive load. (C) 2007 Elsevier Inc. All rights reserved.
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