1 Refinement of corticospinal neuron activity during skilled motor learning Authors: Najet Serradj 1,2 , Francesca Marino 1,2 , Yunuen Moreno-López 1 , Sydney Agger 1,3 , Andrew Sloan 4 , Edmund Hollis 1,5* 1 Burke Neurological Institute, White Plains, NY, USA. 3 University of Illinois, Chicago, IL, USA. 4 Vulintus, Inc., Lafayette, Colorado, USA. 5 Brain and Mind research Institute, Weill Cornell Medicine, NY, USA. 2 These authors contributed equally to this work. *corresponding author: edh3001@med.cornell.edu . CC-BY-NC-ND 4.0 International license available under a (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made The copyright holder for this preprint this version posted March 24, 2021. ; https://doi.org/10.1101/2021.03.22.436415 doi: bioRxiv preprint