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.

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

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 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.
References in periodicals archive ?
For the analysis of EEG tracings, attention was given to the appearance of alpha waves which are associated with a relaxed wakefulness correlated with a general tranquil, pleasant feeling.
The relationship between theta (6-10 Hz) and low frequency alpha waves (11-12 Hz) is evaluated to gain information about a person's problem-solving ability (Wilson, Thompson, Thompson, & Peper, 2011).
These alpha waves show, among other things, how effectively the brain exploits the sensory information needed for learning.
Indicators of cerebral cortex immaturity included polyrhythmic and decreased frequency (6-7 Hz), of alpha waves, and rhythm driving only in the low frequency range (4-7 Hz).
The EEG studies showed a decrease in beta and alpha waves and increase in biphasic spike wave pattern in experimental Aizheimer rat model.
Professor Foxe said: "We found that within 20 minutes of drinking a cup of tea there was an effect on the brain's alpha waves.
Tea contains caffeine, but the body reacts to it differently from coffee because of L-theanine, an amino acid in tea that he says promotes ``focused, meditative energy'' in the brain's alpha waves to counteract the fight-or-flight beta wave response to the caffeine.
They've found that the brain-wave patterns of meditators shift from alpha waves of arousal to theta waves of deep relaxation and problem-solving.
As polysomnographers can attest, it is not unusual to see classic phasic REMs while the EEG is producing alpha waves.
In addition to its ability to make relaxing alpha waves, l-theanine seems to cancel out some of the jittery effects of caffeine.
The researchers calculated the power ratio of alpha waves to theta waves (A/T); the ratio of alpha waves to delta waves (A/D); and the ratio of alpha waves to the sum of theta and delta waves (A/T+D).