Article: Spinal Cord is ‘Smarter’ Than Previously Thought [Medical Xpress]

“This research has shown that a least one important function is being done at the level of the spinal cord and it opens up a whole new area of investigation to say, ‘what else is done at the spinal level and what else have we potentially missed in this domain?'” said the study’s senior and supervising researcher Andrew Pruszynski, Ph.D., assistant professor at Western’s Schulich School of Medicine & Dentistry and Canada Research Chair in Sensorimotor Neuroscience.

“The study, “Spinal stretch reflexes support efficient hand control,” will be published online in the high impact journal Nature Neuroscience.

“This kind of hand control requires sensory inputs from multiple joints—mainly the elbow and the wrist—and these inputs was previously thought to be processed and converted into motor commands by the brain’s cerebral cortex.

“Using specialized robotic technology, a three degree of freedom exoskeleton at Western’s Brain and Mind Institute, subjects were asked to maintain their hand in a target position and then the robot bumped it away from the target by simultaneously flexing or extending the wrist and elbow. The researchers measured the time that it took for the muscles in the elbow and wrist to respond to the bump from the robot and whether these responses helped bring the hand back to the initial target.

“By measuring the latency, or ‘lag’, in the response, they were able to determine whether the processing was happening in the brain or the spinal cord.

“We found that these responses happen so quickly that the only place that they could be generated from is the spinal circuits themselves,” said the study’s lead researcher Jeff Weiler, Ph.D., a post-doctoral fellow at Schulich Medicine & Dentistry. “What we see is that these spinal circuits don’t really care about what’s happening at the individual joints, they care about where the hand is in the external world and generate a response that tries to put the hand back to where it came from.”

Read the full summary from University of Western Ontario at Medical Xpress: Spinal Cord is ‘Smarter’ Than Previously Thought

Their citation: Spinal stretch reflexes support efficient hand control , Nature Neuroscience (2019). DOI: 10.1038/s41593-019-0336-0 , https://www.nature.com/articles/s41593-019-0336-0

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