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Example of spontaneous activity of a high-frequency REM-active neuron. This neuron discharged at higher frequency during REM sleep (average firing rate 84.6 s−1, CV 0.859) as compared with both NREM sleep (average firing rate 30 s−1, CV 0.356) and wakefulness (average firing rate 46.8 s−1, CV 0.42). CV, coefficient of variability; NREM, non-rapid-eye-movement; REM, rapid-eye-movement.
