[Electroencephalographic analysis of wakefulness and the primary form of sleep in the frog, Rana temporaria].

EEG spectral and correlation analyses data were obtained on the forebrain and midbrain during active wakefulness and under sleep-like conditions (primary sleep) in frogs. Autocorrelation analysis indicates that the degree of EEG stability and the content of periodic waves in the EEG during wakefulness and primary sleep are rather low. Cross-correlation connection between the bioelectrical activity in the forebrain primordial hippocamp and midbrain tectum was found to be rather poor. At the background of EEG of primary sleep in the midbrain (and to a lower extent--in the forebrain) spike-like activity was observed which is absent in the wake animals. It is suggested that EEG patterns of primary sleep and wakefulness are essentially different. Possibility of onset of specific electroencephalographic arousal reaction against the background of primary sleep (which differs from that in warm-blooded animals) is noted.