your brain loves that new song
When jazz legend John Coltrane first heard Charlie Parker play the saxophone, the music hit him ''right between the eyes,'' he once said.
According to neuroscientists, Coltrane was exactly right. When we hear music we like, even for the first time, a part of the brain's reward system is activated, a study has shown. The region, called the nucleus accumbens, determines how much we value the song – even predicting how much a person is willing to pay for the track.
''It's a lovely, lovely piece of research,'' says music psychologist David Huron, of Ohio State University, who was not involved in the study. The results will help scientists understand why humans attach so much value to abstract sequences of sound waves. ''Music is one of those oddball things,'' he says. ''It's not at all clear that it has any sort of survival value.''
A favourite song, whether a power rock anthem or a soulful acoustic ballad, evokes a deep emotional response. Neuroscientist Valorie Salimpoor joined Robert Zatorre at McGill University's Montreal Neurological Institute in Canada to study how music affects the brain.
In 2011, she and Zatorre confirmed that dopamine, a reward neurotransmitter, is the source of such intense experiences – the ''chills'' – associated with a favourite piece of music. They showed that listeners' dopamine levels in pleasure centres surged during key passages of favourite music, but also just a moment before – as if the brain was anticipating the crescendo to come.
Ms Salimpoor recruited 19 volunteers, 10 men and nine women aged 18 to 37, who shared musical tastes. She played 30-second samples of 60 songs they'd never heard. Within an iTunes-like user interface, the volunteers then bid on how much they'd be willing to pay for each track, up to $2.
To make the experiment more realistic, participants used their own money and received a CD of their purchased tracks at the end of the study.
Ms Salimpoor monitored how the volunteers' brains reacted to the music using MRI. Multiple brain regions activated when they discovered a new favourite song, but only activity in the nucleus accumbens was well correlated to how much the participants were willing to pay, she and colleagues have reported online in Science.