[readymade]

Without a more cross-cultural study this falls more into the domain of cultural bias (still interesting) than what the title suggests. I'd love to see what the results look like incorporating data from cultures whose musical traditions are rhythmically complex and better documented. Godfried Toussaint's work on Euclidean Rhythms (http://cgm.cs.mcgill.ca/~godfried/publications/banff.pdf) makes for a pretty convincing survey of "evenly spaced" beat distribution, albeit sometimes over uneven lengths. This doesn't even get into things like the polyrhythm and syncopation in much African music or the complex rhythmic cycles found in Indian percussion.

[kj2413]

That's a good point, and we are on it: http://journal.frontiersin.org/article/10.3389/fnins.2016.00... We are working on a follow up in this direction with more cultures. (N.J)

[readymade]

Nice! Looking forward to seeing where this leads :)