Brain, Vol. 123, No. 2, 380-393,
February 2000
© 2000 Oxford University Press
The coordination of bimanual prehension movements in a centrally deafferented patient
1 Centre for Perception, Attention and Motor Sciences, School of Psychology, University of Wales, Bangor, 2 Division of Neuroscience and Psychological Medicine, Imperial College School of Medicine, Charing Cross Hospital, London, 3 Department of Experimental Psychology, University of Bristol and 4 Care of the Elderly, Frenchay Hospital, Bristol, UK
Correspondence to:
Dr Georgina M. Jackson, School of Psychology, University of Nottingham, University Park, Nottingham NG7 2RD, UK E-mail: Gmj{at}Psychology.nottingham.ac.uk
Many everyday tasks require that we use our hands co-operatively, for example, when unscrewing a jar. For tasks where both hands are required to perform the same action, a common motor programme can be used. However, where each hand needs to perform a different action, some degree of independent control of each hand is required. We examined the coordination of bimanual movement kinematics in a female patient recovering from a cerebrovascular accident involving anterior regions of the parietal lobe of the right hemisphere, which resulted in a dense hemianaesthesia of her left arm. Our results indicate that unimanual movements executed by our patient using her non-sensate hand are relatively unimpaired. In contrast, during bimanual movements, reaches executed by our patient using her non-sensate hand show gross directional errors and spatiotemporal irregularities, including the inappropriate coupling of movement velocities. These data are discussed with reference to the role played by limb proprioception in the planning and control of prehension movements.
bimanual movements; reach-to-grasp; deafferentation; hemianaesthesia; parietal cortex
BA = Brodmann area; BIT = Behavioural Inattention Test; MD = movement duration; PGA = peak grip aperture; SI = primary somatosensory cortex; SII = secondary somatosensory cortex; TTPGA% = time taken to reach peak grip aperture expressed as a percentage of total movement time; TTPV = time taken to reach peak movement velocity; WAIS-R = Wechsler Adult Intelligence Scale—Revised
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