Scientists at the University of Colorado Boulder have discovered something that experienced ballroom dancers have long known: When dancers are in tune with each other, their brains may sync up, helping them move as one.

“When we dance, our brains are actually coupling,” said Thiago Roque, a graduate student in the Atlas Institute who led the study. “We are synchronizing our brains through our behavior.”

For the unique experiment, the researchers placed electroencephalogram (EEG) caps, or devices that measure electrical activity in the brain, on pairs doing the Argentine Tango—a sensuous dance where a leader and follower hold each other tight while moving together to music.