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Is the motor system a dictatorship or a democracy? Is the chain of command in the motor system only top-down, or is it a two-way street? This project attempts to answer just that.  Harnessing recent cutting-edge techniques in neuroscience such as large-scale neuronal recordings and optogenetics, this project aims to study how brain and spinal circuits interact as they coordinate locomotion, and how their interaction dynamics is disrupted when their physical connections are disrupted.