It is certainly a debated effect, but at least it'd be a starting point for a discussion. As is, the article is "well, for me...". Any further discussion or research is impossible since it is a purely personal anecdote.

(N.B., since on re-reading this is less than clear from my original post: I did not intend to give a definitive answer to any of the items raised in the article. I do not possess the knowledge to do so. I merely intended to point out trivial starting points for research for this article)