Alpha waves
Alpha waves
Alpha waves (pronounced: /ˈælfə weɪvz/) are a type of brain wave that oscillate between 8 and 12 Hz. They are typically associated with relaxed, meditative states and are most prominent in the posterior regions of the brain during periods of wakeful relaxation with closed eyes.
Etymology
The term "alpha wave" was coined by German neurologist Hans Berger, who is also credited with the discovery of the electroencephalogram (EEG). The term "alpha" is derived from the Greek letter "α" (alpha), which was used because these were the first brain waves discovered and thus represent the start of the Greek alphabet.
Related Terms
- Beta waves: These are brain waves that oscillate between 12 and 30 Hz. They are associated with active, busy or anxious thinking and active concentration.
- Theta waves: These are brain waves that oscillate between 4 and 8 Hz. They are associated with drowsiness, sleep, and dreaming.
- Delta waves: These are the slowest brain waves, oscillating below 4 Hz. They are associated with deep, dreamless sleep and the healing of the body.
- Electroencephalogram (EEG): This is a test that detects electrical activity in your brain using small, metal discs (electrodes) attached to your scalp.
- Neurofeedback: This is a type of biofeedback that uses real-time displays of brain activity to teach self-regulation of brain function.
See Also
External links
- Medical encyclopedia article on Alpha waves
- Wikipedia's article - Alpha waves
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