Figure 4. Latency shift as a function of time after the additional pulse.

Mean and s.e.m. of latency shifts as obtained in protocol 2 (Fig. 3) are depicted as a function of time after the additional pulse for mechano-responsive (□, n = 20) and mechano-insensitive (•, n = 16) afferents. After-effects between 4020 and 6000 ms were evaluated from the second regular AP after the additional pulse. Latency increase is termed ‘slowing’, latency decrease ‘speeding’ of conduction velocity.