[NAFV_P]

Linked article: [0]

I'm guessing the pieces were original works used just for the study, the article doesn't state what was used.

[0] http://news.stanford.edu/news/2006/may31/brainwave-053106.ht...

[yellasrichand]

Looks like the article was compiled from a few different studies:

http://news.harvard.edu/gazette/story/2012/07/when-the-beat-...

http://www.psmag.com/blogs/news-blog/drummers-high-evidence-...

[NAFV_P]

That has sated my curiosity, thank you.