A sample unit for sitting down and the areal distribution of 205 similar units. A. Peri-event time histogram (bin size = 30 ms) of an example unit for squatting down showed high peak activity during the leg releasing phase. Purple inverted triangle: Target Release; pink triangle: Center Hit again. B and C. coronal and vertical view of the distribution areas of related units. CS: Central sulcus, PA: posterior–anterior, DL: dorsal-lateral.