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WaPo |  Some people just can't seem to keep a beat.

You know the ones: They seem to be swaying to their own music or clapping along to a beat only they can hear. You may even think that describes you.

The majority of humans, however, do this very well. We clap, dance, march in unison with few problems; that ability is part of what sets us apart from other animals.

But it is true that rhythm — specifically, coordinating your movement with something you hear — doesn't come naturally to some people. Those people represent a very small sliver of the population and have a real disorder called "beat deafness."

Unfortunately, your difficulty dancing or keeping time in band class probably doesn't quite qualify.

A new study by McGill University researchers looked more closely at what might be going on with "beat deaf" individuals, and the findings may shed light on why some people seem to be rhythm masters while others struggle.