Brain, Vol. 105, No. 3, 515-542, 1982
© 1982 Guarantors of Brain
doi: 10.1093/brain/105.3.515
MANUAL MOTOR PERFORMANCE IN A DEAFFERENTED MAN
From University Department of Neurology, Institute of Psychiatry and King's College Hospital Medical School, Denmark Hill, London SE5, and Royal Free Hospital Medical School, Pond Street, Hampstead London, NW3
We have studied manual motor function in a man deafferented by a severe peripheral sensory neuropathy. Motor power was almost unaffected. Our patient could produce a very wide range of preprogrammed finger movements with remarkable accuracy, involving complex muscle synergies of the hand and forearm muscles. He could perform individual finger movements and outline figures in the air with his eyes closed. He had normal pre- and postmovement EEG potentials, and showed the normal bi/triphasic pattern of muscle activation in agonist and antagonist muscles during fast limb movements. He could also move his thumb accurately through three different distances at three different speeds, and could produce three different levels of force at his thumb pad when required. Although he could not judge the weights of objects placed in his hands without vision, he was able to match forces applied by the experimenter to the pad of each thumb if he was given a minimal indication of thumb movement.
Despite his success with these laboratory tasks, his hands were relatively useless to him in daily life. He was unable to grasp a pen and write, to fasten his shirt buttons or to hold a cup in one hand. Part of his difficulty lay in the absence of any automatic reflex correction in his voluntary movements, and also to an inability to sustain constant levels of muscle contraction without visual feedback over periods of more than one or two seconds. He was also unable to maintain long sequences of simple motor programmes without vision.
Received December 21, 1981.
Revised February 23, 1982.
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