alpha rhythm
alpha wave

Yet she had just checked their alpha rhythms, and they were sleeping deeply.

"Visual reaction time and the human alpha rhythm".

(Some people produce few or no alpha rhythms, even when completely relaxed.)

These subjects tended to squeeze their bulbs when alpha rhythm had reduced - consistent with the idea that these experiences occur when cortical arousal drops.

Recordings of sleep-deprived subjects have shown a reduction in the amplitude of alpha rhythms.

In rested subjects alpha rhythm is indicative of low arousal, but sleep-deprived subjects commonly only achieve this level of arousal at best.

You should make sure they have it properly adjusted to your alpha rhythms, of course.

Well, in the Medic and Psych Center he'd been taught on a biofeedback machine to initiate alpha rhythms for sleep or deep relaxation.

Correlates of alpha rhythm in functional magnetic resonance imaging and near infrared spectroscopy.

The synchronous alpha rhythm ranges from 8 to 13 Hz and is defined by its waveform and not by its frequency.