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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2012-04-30T00:00:00-04:00" class="date-display-single">April 30, 2012</span></p><div class='syndicate'><h1>Device Restores Movement to Paralyzed Limbs</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2012/20120430-movement.jpg?itok=FG4z9tPx&timestamp=1433258178 1x" media="screen and (min-width: 0)" />
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</picture><span class="caption">Motor neurons.</span><span class="credit">Dr. David Becker, Wellcome Images. All rights reserved by Wellcome Images. </span></div>
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</div><p>Monkeys temporarily paralyzed from the elbow down to their fingers were able to grasp and release a ball with the help of electrodes in the brain that directly stimulate the hand muscles. This type of technology may one day help paralysis victims regain muscle control.</p>
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<p>The spinal cord is the main information pathway between the brain and the rest of the body. Injury to the spinal cord often leads to paralysis. About a quarter of a million Americans today are living with spinal cord injuries. Researchers have made some progress in repairing broken connections between the brain and muscles. An alternative approach has been to use brain cell activity to bypass the broken connections and directly control muscles.</p>
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<p>In an effort to restore movement to paralyzed limbs, a team led by Dr. Lee E. Miller at Northwestern University in Chicago set out to create a neuroprosthesis—a device that replaces lost or impaired nervous system function. Their work, which was partially funded by NIH's National Institute of Neurological Disorders and Stroke (NINDS), appeared in the early online edition of <em>Nature</em> on April 18, 2012.</p>
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<p>The scientists studied 2 monkeys that were trained to pick up rubber balls and drop them into a tube. After training, each monkey had a multi-electrode recording array implanted in the area of the brain that controls the hands. This brain-computer interface allowed the scientists to track the activity of about 100 brain cells as the monkeys performed the task. The investigators were also able to decipher the signals that generate arm and hand movements.</p>
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<p>The researchers then used the signals from the implanted interface to control a stimulation device that delivers electrical current to muscles and causes them to contract. This system bypasses the spinal cord and allows the brain to directly control muscle movement.</p>
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<p>To test the device, the researchers gave the monkeys a local anesthetic, which blocked nerve activity at the elbow and caused temporary paralysis of the hand. With the aid of the neuroprosthesis, both monkeys regained movement in the paralyzed hand. They could pick up and move the ball and complete the task as before. The team found that their system also restored the ability to adjust grip strength, which is necessary to perform everyday tasks.</p>
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<p>“With these neural engineering methods, we can take some of the important basic physiology that we know about the brain and use it to connect the brain directly to muscles,” Miller says. “This connection from brain to muscles might someday be used to help patients paralyzed due to spinal cord injury perform activities of daily living and achieve greater independence.”</p>
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<p>While the temporary nerve block used by the team is a useful model of paralysis, Miller cautioned that it doesn't replicate all the changes seen after brain and spinal cord injuries. The next steps will include testing this system in primate models of long-term paralysis and studying how the brain changes as it continues to use this neuroprosthesis.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="http://health.nih.gov/category/BrainandNervousSystem" target="_top">Brain and Nervous System</a></li><li><a href="http://www.ninds.nih.gov/disorders/sci/sci.htm" target="_top">Spinal Cord Injuries</a></li><li><a href="http://www.ninds.nih.gov/disorders/sci/detail_sci.htm" target="_top">Spinal Cord Injury: Hope Through Research</a></li><li><a href="http://www.nih.gov/researchmatters/october2008/10272008neuron.htm" target="_top">Artificial Connections Restore Movement to Paralyzed Limbs</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed?term=Restoration%20of%20grasp%20following%20paralysis%20through%20brain-controlled%20stimulation%20of%20muscles" target="_blank"> Nature</a>. 2012 Apr 18. doi: 10.1038/nature10987. [Epub ahead of print]</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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