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. 2017 Apr 28;11:212. doi: 10.3389/fnhum.2017.00212

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Copyright © 2017 Kronemer, Mandel, Sacktor and Marvel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Fourteen HIV+ participants classified with normal motor function via the Unified Parkinson’s Disease Rating Scale (UPDRS) and supplementary motor function exams (red dashed line) drew fewer figure 8s compared to healthy controls (A,B). Groups did not differ in terms of absolute velocity (C,D) or variability (E,F). These results indicate that a “normal” neurological exam of motor function may not capture subtle motor impairments when performing fine motor tasks or a motor task combined with a cognitive load. Error bars represent standard error of the mean.