alpha wave


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Related to alpha wave: beta wave, theta wave

al·pha rhyth·m

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.
Synonym(s): alpha wave, Berger rhythm

alpha wave

n.
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.

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 wave

Neurology 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 rhythm

or

alpha wave

The 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.

alpha waves 

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.
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National Institute of Standards and Technology in Boulder, Colo., where the device was developed, measured the alpha waves in the brain that were produced in conjunction with a test subject opening and closing his eyes.
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In the first module, "cortical functioning," performed assessments on the basis of alpha-wave characteristics, including, nature of alpha rhythm, alpha-rhythm frequency, amplitude, topography, amplitude asymmetry, and changes in alpha waves in response to the provocative tests (see Table 1).
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