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A, recordings of spinal cord dorsum potential at the L6 segmental level with different time bases, as indicated. Negativity upward. B, power spectrum obtained by averaging the power spectra of the 8 experiments illustrated in C-J. Abscissa, frequency. Ordinates, power as percentage of the maximum attained in each experiment (100 %). Power spectra computed from continuous recordings lasting 1.5 min.
