MIT: How the brain perceives rhythm

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MIT research http://news.mit.edu/2017/how-brain-perceives-rhythm-1205

When it comes to perceiving music, the human brain is much more tuned in to certain types of rhythms than others, according to a new study from MIT.
A team of neuroscientists has found that people are biased toward hearing and producing rhythms composed of simple integer ratios — for example, a series of four beats separated by equal time intervals (forming a 1:1:1 ratio).
This holds true for musicians and nonmusicians living in the United States, as well as members of a Bolivian tribe who have little exposure to Western music. However, the researchers found that the Bolivians tended to prefer different ratios than Westerners, and that these ratios corresponded to simple integer ratios found in their music but not in Western music.