Neurons

Humans may have neurons whose main job is to process singing. Scientists have previously found neurons that are selective for speech and music, suggesting that our brains have specific cells that handle different types of sounds we hear. Sam Norman-Haignere and his colleagues recorded brain electrical activity from 15 people while they listened to 165 different sounds. These included music, speech, animal calls and the sound of a flushing toilet. The participants already had electrodes implanted into their heads, as they were in hospital for epilepsy treatment, which enabled the researchers to get more precise data compared with functional magnetic resonance imaging (fMRI) scans. With these recordings, the researchers discovered a population of neurons that seemed to respond nearly exclusively to singing, although they also had a very small response to speech and instrumental music. 'This work suggests there's a distinction in the brain between instrumental music and vocal music,' says Norman-Haignere. They overlaid these results with fMRI data from 30 other people who listened to the same sounds so that they could map the neurons to a specific region of the brain. The 'singing' neurons were located roughly between the music and speech-selective areas of the auditory cortex. Many people think that singing has some important role in the evolution of music. But it's also totally possible that it's all driven by exposure.