Figure 3. The effect of voluntary torque on the dynamic response to stretch of four muscle spindle afferents.

A-D are the same muscle spindle afferents as in Fig. 2. The upper graphs plot the firing rate just before the end of stretch (○) and that during the static phase of stretch (□) against the voluntary torque. The lower graphs plot the dynamic index. Each point in these graphs represents a mean of two to four records.