Small cluster of neurons is off-on switch for mouse songs

(Duke University) Researchers at Duke University have isolated a cluster of neurons in a mouse's brain that are crucial to making the squeaky, ultrasonic 'songs' a male mouse produces when courting a potential mate. They understand these neurons well enough to be able to make a mouse sing on command or to silence it so that it can't sing, even when it wants to, a key advancement in studying how humans form speech.