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More information. OK Leave. The researchers collected saliva of Penn State students and measured their levels of testosterone and cortisol, a stress hormone. They found that men with higher testosterone levels and lower levels of cortisol generally had deeper voices.
That hormonal signature has previously been associated with healthy immune function. So to some degree, deep voices seem to serve as a kind of evolutionary marker for good health. In modern times, advances in health care have leveled the playing field somewhat. But eons ago, good health meant the ability to pass on genes.
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