Comment 39 by blitz442 :

Muddling through life with a rather pedestrian IQ that grants just enough wit for interest in difficult subjects and the wider problems of the world, but not enough for complete mastery of these subjects or the production of meaningful solutions, would seem to offer a lot of opportunity for frustration that borders on depression. Not speaking from experience, of course.

I see no necessary connection between not having what one wants, in this case a higher IQ, and being depressed.

Nor is it necessary to be depressed if, with your higher IQ, you see that the world is not the way you want it to be.

In my experience, depression, except for organic reasons, is a facet of a belief that one is to blame for not having what one wants.

If we're to be consistent with our skepticism of libertarian free will, we can't blame ourselves for not having what we want.

Cheers.