Neural rhythm
What is a brainwave?
A brainwave is a measurable rhythm created by the synchronized electrical activity of groups of neurons.
Neurons communicate through electrochemical impulses. When many neurons activate together in a rhythmic way, they create oscillations that can be recorded by electroencephalography, or EEG. Each rhythm is described by its frequency, measured in hertz, and by its amplitude, which reflects the strength of the signal.
In simple terms, slower rhythms tend to appear in deeper, quieter states such as sleep, meditation or internal absorption. Faster rhythms tend to appear during alertness, problem solving, sensory integration and intense cognitive activity.
But the brain does not switch from one wave to another like a light switch. All rhythms coexist. When we say the brain is in a Delta, Theta or Alpha state, we mean that one rhythm is more dominant in a particular context.
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