Alpha Rhythm

**Definition:** Brain waves characterized by a relatively high voltage or amplitude and a frequency of 8-13 Hz. They constitute the majority of waves recorded by EEG registering the activity of the parietal and occipital lobes when the individual is awake, but relaxed with the eyes closed.

**Tree numbers:** - E01.370.376.300.150.374 - E01.370.405.245.287.374 - G07.265.087.500 - G11.561.127.500