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Proceedings: A technique for the quantitative characterization of the sleep-wake cycle in the rat.

States of the sleep-wake cycle in the conscious, unrestrained rat with chronically implanted cortical and neck muscle electrodes (Etevenon & Boissier, 1971) were characterized quantitatively by correlating the frequency and amplitude content of the electrocorticogram with that of the electromyogram. This was achieved by analogue filtering, integration and division. Subsequent statistical analysis was performed by digital computation using a programmed calculator; the results were presented in numerical and graphical forms (Figure).