LaTrobe University researchers asked 92 people with varying levels of caffeine intake and stress listen to three minutes of white noise via headphones. The study participants were told that Bing Crosby's "White Christmas" would be playing in the headphones, and when they heard it, to hit a buzzer.
While the song never actually played, the people who were hopped up on five or more cups of coffee buzzed three times on average, while the low-caffeinated people buzzed just once on average, the Herald Sun in Australia reported.
Though this particular study size was small, it's worth noting that the findings match up with that of a study published in 2009 in the same journal. That study showed that highly caffeinated people -- those who had consumed the equivalent of three brewed cups of coffee -- were three times more likely to hear or see things that aren't there, LiveScience reported.
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