I found that along with the papers I was reading, and there were a few papers that supported such conclusions, but the majority do not, and I saw no reason to prefer the papers supporting the conclusion I was expecting to the larger number that did not, so I still consider the issue unresolved, leaning slightly toward “IQ ∝ mental health”.
Here’s one possible link: http://www.news.harvard.edu/gazette/2003/10.23/01-creativity.html
I found that along with the papers I was reading, and there were a few papers that supported such conclusions, but the majority do not, and I saw no reason to prefer the papers supporting the conclusion I was expecting to the larger number that did not, so I still consider the issue unresolved, leaning slightly toward “IQ ∝ mental health”.