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Is there a link between intelligence and mental illness?

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Author's Note: Is there a link between intelligence and mental illness?

When I began researching this article, I wondered how many of the world's historical geniuses would be considered mentally ill were they alive today? Turns out, probably many of them. From the suspected autism of Michelangelo, bipolar tendencies of Sylvia Path and depression of Abraham Lincoln, there are plenty of suppositions to be made. In the end, what I really found interesting was the connection between mental illness and intellect at either end of the spectrum. Both a high IQ and a low IQ are thought to protect against some forms of mental illness -- and potentially cause mental illness, too.

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