What type of brain waves reach a high amplitude and generally fluctuate between 1 to 3 cycles per second?

Delta waves are characterized by their high amplitude and occur at a low frequency, typically ranging from 1 to 3 cycles per second. These brain waves are predominantly associated with deep sleep and restorative phases of slumber. When individuals are in deep, non-REM sleep, delta waves are prevalent, reflecting the brain's activity during this important stage of rest.

In contrast, alpha waves are associated with relaxed, calm, but alert states, usually observed when a person is awake but at rest. Theta waves signify lighter stages of sleep or deep relaxation, occurring at slightly higher frequencies. Beta waves, with their higher frequency, are linked to active thinking, alertness, and problem-solving. Understanding the distinct characteristics of these brain waves is essential in grasping how they relate to different states of consciousness and sleep cycles.