Psych. M.D. - Alpha Waves

Term: Alpha Waves
Definition (Myers): The relatively slow brain waves of a relaxed, awake state.
Definition (alternative):
Alpha waves are electromagnetic oscillations in the frequency range of 8–12 Hz arising from synchronous and coherent (in phase / constructive) electrical activity of thalamic pacemaker cells in the human brain. They are also called Berger's wave in memory of the founder of EEG (Brazier 1970). Alpha waves are one type of brain waves, commonly detected by electroencephalography (EEG) or magnetoencephalography (MEG) and predominantly found to originate from the occipital lobe during periods of waking relaxation with the eyes closed. Conversely alpha waves are attenuated with open eyes as well as by drowsiness and sleep. They are thought to represent the activity of the visual cortex in an idle state. Occipital alpha waves during periods of eyes closed are the strongest brain signals of the EEG. They usually can be detected with the naked eye. An alpha-like normal variant called mu (μ) is sometimes seen over the motor cortex (central scalp) and attenuates with movement, or even with the intention to move. *
Contextual explanation: It is a light wave where it happens in sleep stage 1. The person is really awake in this stage so when the scientists detect this wave it means that the person being observed is most likely to be awaken in small noises or a disturbance.
Related terms and concepts:
Delta Waves
REM Sleep

Relaxation - Alpha Waves Sound and Babies Guppy
Related websites:
Edited by: David

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