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Portal:Alpha wave
{{Dablink|For the 3D platform video game, see [[Alpha Waves]].}}

[[Image:eeg alpha.svg|thumb|Alpha waves |400px|right]]
'''Alpha waves''' are [[neural oscillations]] in the frequency range of 8–12 [[Hertz|Hz]] arising from ''synchronous'' and ''coherent'' (''in phase''/''constructive'') electrical activity of [[Human thalamus|thalamic]] pacemaker cells in humans. They are also called [[Hans Berger|(contracted; show full)awake and resting with eyes closed, and in some kinds of sleep and reversible coma. True, the Jell-O waves are a little slower and of much lower amplitude, barely within normal human limits, but that doesn't tell you much by itself. Hypoxia, encephalitis, and other medical conditions can cause reduced frequency and amplitude, as can drug use."<ref>http://www.straightdope.com/columns/read/2942/can-brainwaves-be-detected-in-lime-jell-o</ref>

==See also==
* [[Binaural beats]]
* [[Neural
_  oscillation]]

===Other brain waves===
* [[Delta wave]] – (0.1–4&nbsp;Hz)
* [[Theta wave]] – (4–7&nbsp;Hz)
* [[Mu wave]] – (8–13&nbsp;Hz)
* [[Beta wave]] – (12–30&nbsp;Hz)
* [[Gamma wave]] – (25–100&nbsp;Hz)

==References==
{{reflist}}
* {{Citation | surname = Brazier | given = M. A. B. | title = The Electrical Activity of the Nervous System | year = 1970 | publisher = Pitman | place = London}}

==External links==
* [http://www.eegproject.com EEG Alpha waves biofeedback interactive game project]

{{SleepSeries2}}

[[Category:Electrodiagnosis]]
[[Category:Meditation]]
[[Category:Electroencephalography]]

[[de:Elektroenzephalografie#Alpha-Wellen]]
[[es:Ondas alpha]]
[[fa:امواج آلفا]]
[[fr:Rythme alpha]]
[[it:Ritmo alfa]]
[[ja:アルファ波]]
[[pl:Fale alfa]]
[[ru:Альфа-ритм]]