The researchers gave a questionnaire to more than 190 NYU psychology students that rated their level of psychopathy. It includes questions such as, “For me what’s right is whatever I can get away with” and “Love is overrated.”

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“The cliche is they [psychopaths] are all in prison, but they’re all over,” Wallisch said.

The students listened to a songs from a wide range of musical selections, from classical to recent Billboard 100 songs, and rated them on a seven-point scale. Most of the songs were unfamiliar to the students. Wallisch and Leal looked for correlations between preferences for certain songs and the students’ scores on the psychopathy scale. They identified about 20 songs that seemed to be particularly popular or unpopular depending on the listener’s level of psychopathy.

The researchers then ran the numbers in the opposite direction. They had other students listen to those songs with the highest correlations to the psychopathy scale and rate the songs. The students’ reactions to the songs predicted to some extent their own scores on the psychopathy scale. The study hasn’t been published in a peer-reviewed journal, and like all early studies may not hold up, but it was presented at the Society for Neuroscience meeting that is being held in Washington this week with about 30,000 attendees.

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Leal said they hadn’t found a pattern yet, if there is any, in what the songs popular or unpopular with people who score high on the psychopathy scale have in common. She originally hypothesized that people high in psychopathy might prefer songs without lyrics — since most lyrics are about something psychopaths don’t care about, namely the singer’s feelings — but that didn’t seem to be the case.

Asked what artists or songs he liked best, Wallisch had the perfect answer: “I’m really not interested in music at all.”