 Beta oscillations in human sensory motor cortex are characteristic signatures of both healthy and pathological movement. They consist of brief, intermittent bursts of high power activity which have been linked to a variety of sensory and motor processes. However, the exact spatial, spectral, and temporal structures of these bursts remain unknown. Our study shows that beta bursts occur in planar, wave-like patterns that travel either parallel or perpendicular to the central sulcus. The two directions are also characterized by different anatomical and physiological properties, suggesting distinct functional roles. Furthermore, the timing of the bursts before and after a movement can be differentiated based on their anatomical, spectral, and spatio-temporal characteristics, implying separate functions. This article was authored by Katharina Zick, Andrew J. Quinn, James J. Bonayuto and others.