Figure 9.

Modulation of the relative input weight from all nerves during behavior. Same data as Figure 6, with a different presentation to illustrate the change of relative importance between peripheral inputs (see Discussion). For each SLN population, the mean evoked peak area in each epoch was divided by the mean evoked peak area at rest. To emphasize the relative importance of the inputs from the three nerves, the mean peak areas of all three nerves are expressed as a percentage of their sum in each epoch. By definition, relative inputs from the three nerves are thus identical during rest (33.3%). The relative weight of DR input increases with respect to that of the two other nerves as the trial progresses. This phenomenon is especially visible in extension trials, which involve a contraction of DR spindle-bearing muscles.