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Delta wave
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{{short description|High amplitude low frequency brain wave}} {{About||the medical syndrome|Wolff–Parkinson–White syndrome|the television show|Delta Wave}} {{Use dmy dates|date=May 2020}} [[File:eeg delta.svg|thumb|A delta wave, recorded in a one-second sample of an EEG (electroencephalograph). This particular wave has a frequency of around 1 Hz. |400px]] '''Delta waves''' are high [[amplitude]] [[neural oscillation]]s with a frequency between 0.5 and 4 [[hertz]]. Delta waves, like other brain waves, can be recorded with [[electroencephalography]]<ref name="isbn0-550-14110-3">{{cite book |author=Walker, Peter |title=Chambers dictionary of science and technology |publisher=Chambers |location=Edinburgh |year=1999 |page=[https://archive.org/details/chambersdictiona00pete/page/312 312] |isbn=0-550-14110-3 |url-access=registration |url=https://archive.org/details/chambersdictiona00pete/page/312 }}</ref> (EEG) and are usually associated with the deep stage 3 of [[NREM]] sleep, also known as [[slow-wave sleep]] (SWS), and aid in characterizing the depth of sleep. Suppression of delta waves leads to inability of body rejuvenation, brain revitalization and poor sleep.<ref>{{Cite book |last1=Abhang |first1=Priyanka A |title=Introduction to EEG- and Speech-Based Emotion Recognition |last2=Gawali |first2=Bharti W. |last3=Mehrotra |first3=Suresh C. |publisher=Academic Press |year=2016 |isbn=9780128044902 |pages=51–79}}</ref> [[File:Sleep EEG Stage 4.jpg|thumb|This is a screenshot of a patient during Slow Wave Sleep (stage 3). The high amplitude EEG is highlighted in red. This screenshot represents a 30-second epoch (30 seconds of data). |500px]]
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