Single unit potential amplitude in relation to the conduction velocity in frog and human.

The single unit potential amplitude increases with the conduction velocity. The absolute value of the potential amplitude depends on the conditions of the actual preparation. Since the conduction velocity is correlated to the nerve fibre size the large single unit potentials represent thick, fast conducting nerve fibres. In cases where the single unit potential activity is so high, that it is difficult to measure conduction velocities or of it is recorded only with one electrode pair, rough information about conduction velocities and classes of nerve fibres can be obtained from the single unit potential amplitudes.