A Disorder of Goal-Directed Actions
Apraxia comprises a wide-spectrum of higher order motor disorders that affect the performance of learned skilled movements. This chapter focuses on limb apraxia and the nature of the spatiotemporal errors that disrupt movement sequences. Cognitive process models are discussed including the Heilman-Rothi dual-component model. This model attempts to reconcile conceptual and preparatory aspects of the motor program with perceptual and kinematic features. Critical to this model is the concept that discrete storage modules contain information pertaining to the visual analysis and recognition of movements and objects, and for the execution of the motor patterns associated with specific movements. Sophisticated neuroimaging methods have been used to visualize the anatomic basis of these intact and disordered praxis functions and will be reviewed to present an updated anatomical model emphasizing the praxis production system.
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