Abstract
Apraxia is a disorder of the skilled movements that are needed successfully perform transitive or intransitive movements, when this disorder is not caused by failures of comprehension, weakness, sensory loss, or involuntary movements. The following forms of upper limb apraxia have been reported to be associated with Parkinson's disease: (1) limb-kinetic apraxia, a loss of the ability to make precise, independent but coordinated finger-hand movements; (2) ideomotor apraxia, a failure to make the correct joint movements, to coordinate these movements with the correct timing, speed, and force; and (3) ideational apraxia, the incorrect sequencing of a series of actions required to complete a goal. This chapter summarizes the means of testing for these different forms of apraxia, the types of errors made by patients with these forms of apraxia, and the pathophysiology and treatment of these disorders.
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