Abstract
1. The effects of the mechanical stimulations on the nerve trunk were exarnined by recording propagated action currents from a single nerve fiber.
2. In the case of single brief mechanical shocks, the nerve fiber responded to them in the ratio of 1:1. A single strong shock produced invariably, repetitive excitation.
3. The response time of the mechanical stimulation was found to lie between those of short electrical pulse and of rheobasic stimulating current.
4. The effect of mechanical pressure on the nerve fiber was identified with the action of catelectrotonus. The pressure on the nerve fiber produced an increase in excitability, and the increased excitability in the portion stimulated with a brief mechanical subthreshold shock lasted about 15msec.
