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. 2013 Nov 11;8(11):e78247. doi: 10.1371/journal.pone.0078247

Figure 4. Angular movement and motoneuron and CPG activity in the protractor-retractor neuro-muscular system during forward stepping.

Figure 4

The panels show the time evolution of the quantities indicated at the panels. Slow and fast relate to motoneurons and corresponding muscles they innervate. The small and wide peaks between the larger and narrower ones in the activity of the slow muscles are generated by the contraction of the antagonistic muscles (passive stretching). The colour code of the activity of the CPG neurons signalizes the association with the motoneuron type. Note that at Inline graphic, the activity of the slow motoneurons was blocked.