Primary motor cortex underlies multi-joint integration for fast feedback control

J. Andrew Pruszynski, Isaac Kurtzer, Joseph Y. Nashed, Mohsen Omrani, Brenda Brouwer and Stephen H. Scott ()
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J. Andrew Pruszynski: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6
Isaac Kurtzer: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6
Joseph Y. Nashed: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6
Mohsen Omrani: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6
Brenda Brouwer: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6
Stephen H. Scott: Centre for Neuroscience Studies, Queen’s University, Kingston, Ontario, Canada K7L 3N6

Nature, 2011, vol. 478, issue 7369, 387-390

Abstract: Joint movement tracked by a feedback pathway For animals with multi-joint limbs, one of the daunting problems that the nervous system has to solve is how to correctly interpret and respond to sensory input induced by complex combinations of limb movements. For example, one apparently simple displacement of the shoulder could arise from an infinite number of different combinations of forces acting at the shoulder and elbow. Pruszynski et al. use neurophysiological recordings in monkeys and stimulation studies in humans to demonstrate that knowledge of limb mechanics is solved through a feedback pathway involving the primary motor cortex (M1), rather than through the feed-forward processing of motion variables, a view which has been dominant for the past 25 years. The results have implications for the design of humanoid robots and brain–machine interfaces, as well as for understanding and treating patients with motor dysfunctions such as stroke.

Date: 2011
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DOI: 10.1038/nature10436

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