Therefore, if the subject is in a fully awake state but hears sound frequencies which approximates brainwave output at the Theta level, the subject’s brain will endeavor to alter its brainwave pattern from the normal Beta to the Theta level.
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René Descartes (1596–1650), 1647 - 1648 Frans Hals | SMK Open (open.smk.dk)
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Analysis and Assessment of Gateway Process
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