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I'm not sure if this is the right place to ask this but Biology seemed to fit best.

I'm trying to find out what frequencies the brain responds to best while sleeping.

The reason for this is recently I attended a lecture where it was stated that the brain hears low frequencies/deep noises better, meaning fire alarms for example might not be as effective as we think.

However I remember there was an episode of The Big Bang Theory where they said high pitch noises are heard better while sleeping as a built in response to, for example, a baby crying. Now I know this is just a TV show but I presume they must have some basis for the remark since they do have science advisors, it also just seems to make more sense.

Does anyone know which is correct or better yet can point me in the direction of some research to help.

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Just to point out that the big bang theory episode states that women are more likely to respond to high pitched sounds such as a baby crying. I have no idea if it is true but it makes perfect evolutionary sense. –  terdon Oct 1 '12 at 15:55
On a less serious sidenote: I know Francis Crick was an advocate of his brain@40Hz theory. / I would advocate for the Sceptics.SE site, which deals with scrutinizing notable sources... –  Lo Sauer Oct 1 '12 at 16:13
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