Figure 1 : Polygraphic recording of the adult cat, showing waking
and the two states of sleep
- Waking: muscular activity of the neck (EMG), eye movements (EM),
fast low-voltage activity of the occipItal. cortex (CX), and sharp waves
in the lateral genicu late (LG) which accompany eye movements.
- Slow-wave sleep: decreased muscular activity of the neck, absence
of eye movements, high-voltage slow waves on the cortex, and high-voltage
geniculate waves which directly precede paradoxical sleep by 1 or 2
- Paradoxical sleep: total disappearance of EMG activity. together
with rapid eye movements, fast low-voltage cortical activity. and clusters
of high-voltage lateral geniculate waves. Each line represents l minute
of recording; amplitude calibra tion, 50 microvolts.