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Alpha beats meditation8/6/2023 ![]() The second occurrence of alpha wave activity is during REM sleep. The mature alpha wave, at 10 waves per second, is firmly established by age 3. This wave begins appearing at around four months, and is initially a frequency of 4 waves per second. This alpha activity is centered in the occipital lobe, although there has been speculation that it has a thalamic origin. The most widely researched is during the relaxed mental state, where the subject is at rest with eyes closed, but is not tired or asleep. Some researchers posit that there are at least two forms of alpha waves, which may have different functions in the wake-sleep cycle.Īlpha waves are present at different stages of the wake-sleep cycle. Īn alpha-like variant called a mu wave can be found over the primary motor cortex. ![]() Occipital alpha waves during periods of eyes closed are the strongest EEG brain signals. More recent papers have argued that they inhibit areas of the cortex not in use, or alternatively that they play an active role in network coordination and communication. Historically, they were thought to represent the activity of the visual cortex in an idle state. Alpha waves are reduced with open eyes and sleep, while they are enhanced during drowsiness. They can be predominantly recorded from the occipital lobes during wakeful relaxation with closed eyes and were the earliest brain rhythm recorded in humans. Īlpha waves are one type of brain waves detected by electrophysiological and closely related methods, such as by electroencephalography (EEG) or magnetoencephalography (MEG), and can be quantified using quantitative electroencephalography (qEEG). Historically, they are also called "Berger's waves" after Hans Berger, who first described them when he invented the EEG in 1924. Alpha waves, or the alpha rhythm, are neural oscillations in the frequency range of 8–12 Hz likely originating from the synchronous and coherent ( in phase or constructive) electrical activity of thalamic pacemaker cells in humans.
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