Fig. 9. Response characteristics of TSR-1 and TSR-2 to stretch stimuli. Both TSR-1 (A) and TSR-2 (B) (see insets) show slowly adapting impulse discharges in response to a stretch stimulus (time scales: 3 s in A and 5 s in B) but, as seen from the impulse frequency/stretch amplitude relationship, TSR-2 has a wider dynamic range than TSR-1. The impulse frequency/stretch relationship of TSR-2 is linear between 0.2 and 3.8 mm. The two examples in A and B were obtained from separate animals. The plots were obtained by counting impulses during the static phase within 5 s of initiation of a stretch stimulus.