Sound Cues and Circadian Rhythms

July 22, 2010

Yesterday, I showed how environmental, behavioral, and social cues act as zeitgebers to human circadian rhythms, and I tried to be as thorough as possible (without outstaying my welcome). I left out one very important environmental cue with the promise of more information today – sound.
I can’t recall exactly where I heard about it, but it was someone’s offhand reference to the notion of the calls of songbirds affecting our circadian rhythms that convinced me I should do a follow-up to the blue light piece from earlier this year. The notion of bird calls affecting us on a deeper level than a regular sound makes some intuitive sense to me, so I did some searching to see if there was anything to it.

There’s certainly a precedent for the phenomenon in animal research. For years, researchers have known that auditory cues exert potent entraining effects on the circadian rhythms of animals. […]

Original post by Mark Sisson

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