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    Gamma brainwaves (32 - 100 Hz): Heightened perception, learning, problem-solving tasks
    Beta  brainwaves (13 - 32 Hz):  Alert, normal alert consciousness, active thinking
    Alpha brainwaves (8 - 13 Hz):   Physically and mentally relaxed
    Theta brainwaves (4 - 8 Hz):    Creativity, insight, dreams, reduced consciousness
    Delta brainwaves (0.5 - 4 Hz):  Sleep, dreaming
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