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1. a wave pattern in the encephalogram in the frequency band of 8-13 Hz;
2. the posterior dominant 8-13 Hz rhythm in the awake, relaxed person with closed eyes, that attenuates with eye opening.
An electrical oscillation occurring in the human brain at a frequency of about 8 to 13 hertz as recorded on an electroencephalogram, associated with a state of relaxed wakefulness. Also called alpha rhythm.
one of several types of brain waves, characterized by a relatively high voltage or amplitude and a frequency of 8 to 13 Hz. Alpha waves are the "relaxed waves" of the brain and constitute the majority of waves recorded by electroencephalograms registering the activity of the parietal and the occipital lobes and the posterior parts of the temporal lobes when the individual is awake but nonattentive and relaxed, with the eyes closed. Opening and closing the eyes affect the patterns of the alpha waves and the beta waves. Also called alpha rhythm, Berger wave.Compare beta wave,delta wave, theta wave.
alpha wave“Superficial” brain waves which have a frequency of 8 to 12 cycles/second (Hz), with an amplitude of 50 µV; alpha waves are normally present in the occipital and parietal lobes, and are intentionally induced in Silva mind control, an alternative form of psychological therapy, as Silva believed that the alpha pattern is typical of daydreaming.
alpha waveNeurology A superficial brain wave with a frequency of 8–13 cycles/sec–Hz, an amplitude of 50 µV, which is normally seen by EEG in the occipital and parietal lobes. See Alpha rhythm, Brain waves, Silva mind control. Cf Mantra, Meditation, Theta waves, Yoga.
alpha waveThe most prominent waveform found in the ELECTROENCEPHALOGRAM-the recording electrical activity of the brain. It is characterized by 8 to 12 oscillations per second when the subject is at rest.
Rhythmic oscillation in electrical potential occurring in the cortex of the human brain when awake and at rest. The rate of oscillation is 8-13 Hz. Syn. alpha rhythm. See resting membrane potential.