What is the frequency range of delta waves observed in an Electroencephalogram (EEG)?

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Frequencies exceeding 14 HzFrequencies ranging from 8 to 13 HzFrequencies below 3.5 HzFrequencies between 4 and 7 Hz

Explanation

Delta waves in an EEG are characterized by frequencies less than 3.5 Hz. Other brain wave types have higher frequency ranges, such as alpha waves (8-13 Hz), beta waves (above 14 Hz), and theta waves (4-7 Hz).