Hardesty RL, Ellaway PH, Gritsenko V. The human motor cortex contributes to gravity compensation to maintain posture and during reaching. J Neurophysiol. 2023;129(1):83-101. 

Wolpaw J, Kaas JH. Taking sides: corticospinal tract plasticity during development. Neurology [Internet]. 2001;57:1530?1531. http://www.ncbi.nlm.nih.gov/pubmed/11706084