Brain, Vol. 122, No. 6, 1169-1182,
June 1999
© 1999 Oxford University Press
Spatial deficits in ideomotor limb apraxia
A kinematic analysis of aiming movements
1 Psychology and Research Services, Veterans Affairs Medical Center and University of New Mexico, Albuquerque, 2 Department of Psychology, University of California, Berkeley, 3 Department of Neurology and Center for Neuroscience, University of California, Davis and Veterans Affairs Medical Center, Martinez, USA
Correspondence to:
Kathleen Y. Haaland, Psychology Service 116B, Veterans Affairs Medical Center, 1501 San Pedro SE, Albuquerque, NM 87108. E-mail: khaaland{at}unm.edu
Ideomotor limb apraxia is a classic neurological disorder manifesting as a breakdown in co-ordinated limb control with spatiotemporal deficits. We employed kinematic analyses of simple aiming movements in left hemisphere-damaged patients with and without limb apraxia and a normal control group to examine preprogramming and response implementation deficits in apraxia. Damage to the frontal and parietal lobes was more common in apraxics, but neither frontal nor parietal damage was associated with different arm movement deficits. Limb apraxia was associated with intact preprogramming but impaired response implementation. The response implementation deficits were characterized by spatial but not temporal deficits, consistent with decoupling of spatial and temporal features of movement in limb apraxia. While the apraxics' accuracy was normal when visual feedback was available, it was impaired when visual feedback of either target location or hand position was unavailable. This finding suggests that ideomotor limb apraxia is associated with disruption of the neural representations for the extrapersonal (spatial location) and intrapersonal (hand position) features of movement. The non-apraxic group's normal kinematic performance demonstrates that the deficits demonstrated in the apraxic group are not simply a reflection of left hemisphere damage per se.
limb apraxia; stroke; left hemisphere damage; kinematic analysis; motor
BA = Brodmann area
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