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We report a 67-year-old left-handed man who exhibited an ideational apraxia in both clinical and nonclinical natural settings following a right hemisphere infarction. His inability to use tools could not be explained by a motor production deficit (ideomotor apraxia), because he made content errors and could not match tools with objects. His deficit could(More)
Theoretical models of praxis have two major components, a praxis conceptual system that includes knowledge of tool use and mechanical knowledge and a praxis production system that includes the information needed to program skilled motor acts. Because patients with Alzheimer's disease may have an impairment of the central conceptual system, we wanted to(More)
We report our observations on praxis in a strongly right-handed man following a massive stroke that resulted in virtually complete destruction of the left cerebral hemisphere. Our patient was severely impaired in pantomiming transitive gestures with the left hand and in reproducing novel non-symbolic hand and arm movement sequences. However, overlearned(More)
A left hemisphere damaged patient with ideomotor apraxia is described, whose performance on pantomime to verbal command was superior to pantomime imitation. His reception of these same gestures (gesture naming) was spared. This syndrome has been named conduction apraxia. To account for this selective impaired performance on gesture imitation, a separation(More)
We report a patient with slowly progressive bilateral limb apraxia associated with an asymmetrical focal degenerative process of the parietal lobes. Clinical assessment of praxis production suggested a striking deficit in controlling the spatiotemporal attributes of purposeful skilled limb movements, consistent with ideomotor apraxia. The precise nature of(More)
We studied imagery for learned, skilled movements (praxis imagery) in a patient with severe ideomotor apraxia and intact language abilities. This patient, who made predominantly spatial and movement errors when performing transitive movements demonstrating the use of tools (transitive gestures), was also impaired in her ability to answer imagery questions(More)
Limb apraxia is an impairment in the ability to perform skilled, purposive limb movements as the result of neurological dysfunction. In right-handed individuals, limb apraxia is associated with left hemisphere lesions. This article reviews the subtypes and neuroanatomic correlates of limb apraxia, including limb kinetic apraxia, ideomotor apraxia,(More)
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