[Dynamics of changes in the amplitude of the N1-component of the cord dorsum potential during frequency-modulated stimulation of peripheral afferents].

Cord dorsum potentials were evoked by frequency-modulated stimulation of peripheral afferents in anesthetized cats. Amplitude changes of N1-component of these potentials were studied. The phase of amplitude oscillations was opposite to the phase of the sinusoidal modulation signal in the frequency range from 0.2 to 10.0 Hz. At the same time the amplitude of antidromic discharges in the dorsal roots evoked by stimulation of afferents in the zone of their entrance into the spinal cord was changed synphasically to the modulation signal. It is suggested that the observed changes in the N1-component of the cord dorsum potential depend mainly on variations in the level of the primary afferent depolarization.