PT - JOURNAL ARTICLE AU - Steven M. Peterson AU - Satpreet H. Singh AU - Nancy X. R. Wang AU - Rajesh P. N. Rao AU - Bingni W. Brunton TI - Behavioral and Neural Variability of Naturalistic Arm Movements AID - 10.1523/ENEURO.0007-21.2021 DP - 2021 May 01 TA - eneuro PG - ENEURO.0007-21.2021 VI - 8 IP - 3 4099 - http://www.eneuro.org/content/8/3/ENEURO.0007-21.2021.short 4100 - http://www.eneuro.org/content/8/3/ENEURO.0007-21.2021.full SO - eNeuro2021 May 01; 8 AB - Motor behaviors are central to many functions and dysfunctions of the brain, and understanding their neural basis has consequently been a major focus in neuroscience. However, most studies of motor behaviors have been restricted to artificial, repetitive paradigms, far removed from natural movements performed “in the wild.” Here, we leveraged recent advances in machine learning and computer vision to analyze intracranial recordings from 12 human subjects during thousands of spontaneous, unstructured arm reach movements, observed over several days for each subject. These naturalistic movements elicited cortical spectral power patterns consistent with findings from controlled paradigms, but with considerable neural variability across subjects and events. We modeled interevent variability using 10 behavioral and environmental features; the most important features explaining this variability were reach angle and day of recording. Our work is among the first studies connecting behavioral and neural variability across cortex in humans during unstructured movements and contributes to our understanding of long-term naturalistic behavior.