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Scientists Identify Brain Circuits Related to the Initiation of Termination of Movement Sequences in NIH-Supported Study
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<p><time datetime="2010-07-22T12:00:00Z">Thursday, July 22, 2010</time>
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<p>In humans, throwing a ball, typing on a keyboard, or engaging in most other physical activities involves the coordination of numerous discrete movements that are organized as action sequences. Scientists at the National Institutes of Health and the Gulbenkian Institute in Portugal have identified brain activity in mice that can signal the initiation and termination of newly learned action sequences. The findings appear online today in the current issue of Nature. </p>
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<p>“This interesting report should advance our understanding of the neurobiology of movement disorders, and open new avenues of research for their treatment and prevention,” says Kenneth R. Warren, Ph.D., acting director of the National Institute on Alcohol Abuse and Alcoholism (NIAAA), part of the NIH. </p>
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<p>The study was conducted by Xin Jin, Ph.D. an investigator in the NIAAA Laboratory for Integrative Neuroscience, and Rui M. Costa, D.V.M, Ph.D., principal investigator of the Champalimaud Neuroscience Program at the Gulbenkian Institute. The researchers trained mice to press a lever exactly eight times to receive a sugar-water reward. As the mice learned this task, the researchers monitored brain cell activity in the animals’ basal ganglia, deep brain structures that are known to help start and control movement.</p>
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<p>“We recorded activity in the dorsal striatum and substantia nigra during the learning of novel action sequences,” explained Dr. Jin. “Although previous studies have reported changes in neural activity in these areas during movement, their role in the initiation and termination of newly learned action sequences has not been explored.”</p>
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<p>Drs. Costa and Jin discovered that certain neurons in these regions exhibited a change in activity before the first lever press of a sequence, while other neurons showed a change in activity before the last press of a sequence. They also noticed that this activity signaling the initiation and termination of each action sequence emerged during learning. </p>
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<p>The researchers then evaluated these circuits in mice that had been genetically manipulated to disrupt the development of the start and stop signals. The researchers found the manipulation had impaired the learning of the lever-pressing sequence.</p>
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<p>"Our findings demonstrate that as we learn novel action sequences, these basal ganglia circuits develop activity that signals the beginning and end of each sequence," says Dr. Costa. "These results could have important implications for disorders where these circuits degenerate, such as Parkinson's and Huntington's disease, in which the initiation and termination of voluntary movement sequences are impaired. More broadly, they are relevant for understanding how we learn and control the execution of behavioral sequences, which may impact disorders of action control like compulsivity."</p>
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The National Institute on Alcohol Abuse and Alcoholism (NIAAA), part of the National Institutes of Health, is the primary U.S. agency for conducting and supporting research on the causes, consequences, diagnosis, prevention, and treatment of alcohol use disorder. NIAAA also disseminates research findings to general, professional, and academic audiences. Additional alcohol research information and publications are available at <a href="/" rel="nofollow noreferrer">www.niaaa.nih.gov</a>.</p>
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NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <a href="https://www.nih.gov/" rel="noreferrer noopener">www.nih.gov</a>.</p>
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