Delta waves are a type of brainwave that are characterized by their low frequency (typically 0.5 to 4 Hz) and high amplitude. They are one of the five main types of brainwaves, the others being alpha, beta, gamma, and theta waves. Delta waves are predominantly present during deep sleep stages, particularly during non-REM (rapid eye movement) sleep. Key characteristics of delta waves include: 1. **Frequency**: Delta waves range from 0.
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