“When you think about it, human language is very inefficient, it is very prone to errors,” Schnöller says. Humans use phonemes—basic units of sound, like kah, puh, ah, tee—to create words, sentences, and, ultimately, meaning. (English has about forty-two phonemes, which speakers shuffle around to create tens of thousands of words.) While we can usually convey phonemes clearly enough for others to understand them, we can never fully replicate them the same way each time we speak. The frequency, volume, and clarity of the voice shifts constantly, so that the same word uttered twice in a row by
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