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What's your opinion of binaural beats?

alleged uses: there are reducing learning time and sleeping needs (theta waves are thought to improve learning, since children, who have stronger theta waves, and remain in this state for a longer period of time than adults, usually learn faster than adults; and some people find that half an hour in the theta state can reduce sleeping needs up to four hours; however, this is supposed to happen with any way to get into theta state, e.g. meditation); some use them for lucid dreaming and even for achieving out-of-body experiences, astral projection, telepathy and psychokinesis. However, most people believe that these phenomena (except lucid dreams, which are acknowledged even by mainstream science) do not exist, let alone that they can be achieved by entraining the brain to a specific frequency.
Binaural beats have also been used experimentally for the treatment of addictions, and for the recovery of repressed memories, but as with other techniques this can lead to false memories.

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