Читать книгу Neurology - Charles H. Clarke - Страница 138

Alpha activity seen over the occipital lobes is 8–14 Hz – some 150 μV amplitude and attenuates on eye opening.

Theta activity of 4–7 Hz is also seen, and becomes prominent during drowsiness.

Delta activity is a slower frequency, less than 4 Hz. Delta waves around 1 Hz appears during the first non‐REM sleep period.

Beta activity is a normal largely frontal rhythm faster than 14 Hz.