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To determine whether striatal cholinergic interneuron excitation can cause potentially dystonic motor behaviors, we first determined features correlated specifically with dystonia severity in people and then determined whether these features emerged in mice following striatal cholinergic interneuron excitation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Eight movement disorders experts rated dystonia severity in 193 videos of people with cerebral palsy doing a seated task. Leg adduction variability metrics, which are known to correlate with leg dystonia severity during gait, were quantified in these videos of seated tasks. Metrics significantly associated with leg dystonia severity during seated tasks in people were then quantified in mice and compared between mice who underwent chemogenetic striatal cholinergic interneuron excitation (n\u2009=\u200917) and mice who did not (n\u2009=\u200917).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Leg adduction variability correlated well with experts' leg dystonia severity scores in people. Leg adduction variability was also significantly increased in mice that underwent striatal cholinergic interneuron excitation compared to mice that did not (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). This difference was not present with acute excitation and emerged only after 14\u2009days of ongoing excitation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Interpretation<\/jats:title>\n                    <jats:p>We demonstrate that leg adduction variability correlates with leg dystonia severity in people with cerebral palsy and that chronic, but not acute, striatal cholinergic interneuron excitation can cause leg adduction variability in mice. These results support targeting striatal cholinergic interneurons for dystonia drug development and demonstrate the potential value of using quantifiable leg adduction metrics to study dystonia pathophysiology. 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