[Analysis of spinal neuron transformation of sinusoidal depolarizing activity into spike activity in the cat].
Impulse activity evoked in spinal neurons by sinusoidal depolarizing currents injected through intracellular microelectrode was studied in anesthetized cats. Logarithmic amplitude and phase frequency characteristics are plotted for the first harmonic component of the firing rate. Extreme values of the current were chosen within the linear zone of the firing rate dependence on the current intensity. Amplitude characteristics showed relatively small changes within a frequency range of 0.2 divided by 10.0 Hz, whereas the phase of output signal was found to lead the input one. Mean phase shifts were 32 degrees, 50 degrees and 83 degrees at frequencies of 1, 5 and 10.0 Hz, respectively. Transformation of depolarizing currents to neuronal firing rate is shown to possess pronounced nonlinear dynamic properties. Frequency characteristics of neuronal activity are discussed with respect to dynamic properties of the movement control system.
D000200:Action Potentials; D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D002415:Cats; D004594:Electrophysiology; D005071:Evoked Potentials; D007395:Interneurons / Q000502:physiology; D009046:Motor Neurons / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology*
Analiz preobrazovaniia spinal'nymi neĭronami koshki sinusoidal'nykh depoliarizuiushchikh vozdeĭstvii v impul'snuiu aktivnost'.