Definitions for "Alpha Waves"
Keywords:  eeg, awake, relaxed, quiet, waking
These are found mainly in adults who are awake, have their eyes shut, and are deeply relaxed.  They facilitate inspiration, fast assimilation of facts, and heightened memory.  Less than half and epoch (about 30 seconds) of continuous alpha rhythm indicates sleep onset.
brain waves with a frequency of 8-13 cycles per second that are produced when a person is relaxed but awake.
EEG waves between eight and 12 or 13 cycles per second (Hertz); accompany a relaxed waking state, generally when the eyes are closed.