Bruce Bower spots a case study on beat deafness:

Mathieu [a man with beat deafness] flails in a time zone of his own when bouncing up and down to a melody, unlike people who don’t dance particularly well but generally move in sync with a musical beat, according to a team led by psychologists Jessica Phillips-Silver and Isabelle Peretz, both of the University of Montreal. What’s more, Mathieu usually fails to recognize when someone else dances out of sync to a tune, the researchers report in a paper that will appear in Neuropsychologia.

The unembeddable visuals resemble last fall's study on bad and good dancers.