Fig. 5a–d.

Data summary for a representative 4-mm tensile test. a Multiunit impulses of action potentials. T on the voltage axis indicates a threshold level used to obtain multiunit histogram of discharge rates in b. b Multiunit discharge rate increased during stretch. c An identified C afferent (CV=2.48 m/s) with the waveshape shown in the inset exhibited increased discharge rate after a specific threshold. d Capsular load increased nonlinearly with time during stretch, and showed stress relaxation during the 10 s hold