Although interesting, this isn't particularity surprising (at least not to me). Mood disorders have a high correlation with atypical brain morphology. This is d

Although interesting, this isn't particularity surprising (at least not to me). Mood disorders have a high correlation with atypical brain morphology. This is due to the fact that abnormal brains often result in abnormal temperament. Although correlation doesn't always imply causation, in this particular case it probably does. Most individuals affected by these conditions likely express phenotypes on the edges of the bell curve (not necessarily just regarding intelligence).