It does associated with intelligence in my opinion but I may sound narcissistic if I write it that way. Tho most of my friends disagree bout how intelligence may affect depression. It's either I am not as smart as I think or they are too dumb to see. But as a logical reason I might have to agree with it, if you look it from other side, there is so little of people with above average IQ(I am not sure of the numbers) thus making it hard to find someone who have the same vision, and witty minds :)