Amputation disrupts not only the peripheral nervous system but also central structures of the brain. While the brain is able to adapt and compensate for injury in certain conditions, in amputees the traumatic event prevents adaptive cortical changes. A group of scientists reports adaptive plastic changes in an amputee’s brain following implantation of multielectrode arrays inside peripheral nerves. Their results are available in the current issue of Restorative Neurology and Neuroscience.
“We found that a neurally-interfaced hand prosthesis re-established communication between the central and peripheral nervous systems, not only restructuring the areas directly responsible for motor control but also their functional balance within the bi-hemispheric system necessary for motor control,” says lead investigator Camillo Porcaro, PhD, of the Institute of Neuroscience, Newcastle University, Medical School, Newcastle upon Tyne, UK and the Institute of Cognitive Sciences and Technologies (ISTC) – National Research Council (CNR).
A 26-year old male with a left arm amputation was implanted with four microelectrode arrays in the ulnar and median nerves of his stump for four weeks. Prior to implantation, he was trained for two weeks by video to perform three specific movements with his phantom hand. During the experimental period, he underwent intensive training to control a hand prosthesis using the implanted microelectrodes to perform the same hand grip tasks. Together with visual feedback from the prosthesis, the patient received sensory feedback from an experimenter, who delivered electrical pulses to the nerves activated by each movement. EEG signals were recorded as the patient moved his right hand and the prosthesis.
The patient’s right hand movement showed clear activation of the primary sensory and motor areas for right hand movement, on the left side of the brain. Prior to implantation, commands to move the phantom left hand triggered the primary sensory and motor areas on the left side of the brain, and the pre-motor and supplementary motor cortices on both sides of the brain. No primary motor cortex movement was found on the right side of the brain, as would be expected.
After the four weeks of prosthesis motor control training with implanted microelectrodes, cerebral activation changed markedly. Cortical recruitment became almost symmetrical with right hand movements. The presence of intra-fascicular electrodes allowed new signals to be delivered through peripheral nerves towards the cortex and produced an intensive exchange of sensori-motor afferent and efferent inputs and outputs. Four weeks of training led to a new functional recruitment of sensorimotor areas devoted to hand control.
“Taken together, the results of this study confirm that neural interfaces are optimal candidates for hand prosthesis control,” says Dr. Porcaro. “They establish communication channels needed for natural control of the prosthesis. Furthermore, neural interfaces recreate the connection with the environment that promotes restorative neuroplasticity. Bi-hemispheric networks regain the physiological communication necessary for motor control.”
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NOTES FOR EDITORS
“A neurally -interfaced hand prosthesis tuned inter-hemispheric communication,” by G. DiPino, C. Porcaro, M. Tombini, G. Assenza, G. Pellegrino, F. Tecchio, P.M. Rossini. Restorative Neurology and Neuroscience, 30:5 (September 2012). DOI: 10.3233/RNN-2012-120224. Published by IOS Press online ahead of issue.
Full text of the article is available to credentialed journalists. Contact Daphne Watrin, IOS Press, +31 20 688 3355, firstname.lastname@example.org. Journalists wishing to interview the authors should contact Camillo Porcaro at email@example.com or Paolo Maria Rossini at firstname.lastname@example.org.
ABOUT RESTORATIVE NEUROLOGY AND NEUROSCIENCE (RNN)
An interdisciplinary journal, Restorative Neurology and Neuroscience publishes papers relating the plasticity and response of the nervous system to accidental or experimental injuries and their interventions, transplantation, neurodegenerative disorders and experimental strategies to improve regeneration or functional recovery and rehabilitation. Experimental and clinical research papers adopting fresh conceptual approaches are encouraged. The overriding criteria for publication are novelty, significant experimental or clinical relevance and interest to a multidisciplinary audience.www.iospress.nl/journal/restorative-neurology-and-neuroscience
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