If Guillermo Cecchi wants to figure out if youve taken MDMA or meth, all he needs is a computer and a recording of your voice. Cecchi is a computer scientist at IBM, and part of a growing community of scientists who think our voices can reveal far more than our sex, age, or cultural origins. This is exactly what psychiatrists do every day: they talk to the patients, Cecchi says, but we used machine learning and mathematics to replicate it. In a study published earlier this year, Cecchi used recordings of short interviews to determine which drug his test subjects had been given prior to the experiment.
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