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[mass noun] Electrical activity of the brain at a frequency of around 1–8 Hz, typical of sleep. The resulting oscillations, detected using an electroencephalograph, are called delta waves.
- ‘Research has shown alpha wave intrusion into non-REM delta wave sleep 70% greater than controls.’
- ‘The amplitude of delta waves is very high relative to other frequencies.’
- ‘By stage 4, the brain produces delta waves almost exclusively.’
- ‘Brain research has shown that using sound phasing for brain synchrony will adjust the brain waves to deeper states down to the delta wave pattern.’
- ‘As the participant enters deeper sleep, large amplitude delta waves may be observed.’
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