![]() Theta ranges from 4-8 Hz, and tends to be more prominent in childhood than adulthood. It is the de facto finding of slow wave sleep, where it's seen diffusely, but is also commonly found overlying structural abnormalities such as tumors, or over the bifrontal regions in some patients with encephalopathy. Delta is the slowest at 0-4 Hz, and generally speaking should not be present in a normal awake brain. ![]() There are four main frequencies of the human brain seen on scalp EEG, in increasing order: delta, theta, alpha and beta. Frequency describes how many waves there are per second, and is measured in hertz (Hz). Recognizing the frequency of the waveforms is fundamental to interpreting EEG.
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