Delta waves indicate the slowest type of brain activity. These rhythms are seen during deep sleep.
In terms of activity, Theta waves fall between Delta and Alpha. They are characteristic of someone who is drowsy or in light sleep. They can also be produced by someone who is hypnotized, day dreaming, or lucid dreaming.
These brain-waves are characteristic of normal consciousness. When you are awake, your brain is probably producing alpha waves.
Beta waves are seen when a person is very active, under stress or concentrating hard on a task. They are high frequency waves and indicate that the brain is working hard.
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