Listeners can not only distinguish the age and gender but also can accurately determine the relative heights of speakers just by listening to them talk, finds a new study. The key clue may be contained in a particular type of sound produced in the lower airways of the lungs, known as a subglottal resonance. "The best way to think about subglottal resonances is to imagine blowing into a glass bottle partially full with liquid: the less liquid in the ...
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