Figure 4.

An example of typical activity of CT5 neurons. A, Activity of a CT5 neuron at rest and during simple and complex locomotion. The bottom trace shows the swing (Sw) and stance (St) phases of the step cycle of the forelimb contralateral to the recording site in the cortex. B, C, Activity of the same neuron during simple locomotion is presented as a raster of 50 step cycles (B) and as a histogram (C). In the raster, the duration of step cycles is normalized to 100%, and the raster is rank ordered according to the duration of the swing phase. The beginning of the stance phase in each step is indicated by an open triangle. In the histogram, the interrupted line shows the level of activity at rest. The horizontal black bar shows the step-related PEF, as defined in Materials and Methods. D, E, Activity of the same neuron during complex locomotion presented as a raster (D) and as a histogram (E). Vertical scale bar: C, E, 20 imp/s.