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Re:IQ decline and Piaget: Does the rot start at the top? [pdf] by sanxiyn on Tuesday January 04, 2022 @01:53PM (#29798484)
High IQ seems to correlate with bipolar disorder, but that's about it. It's the only negative that correlates with intelligence I know about.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705611/

Re:IQ decline and Piaget: Does the rot start at the top? [pdf] by Apocryphon on Tuesday January 04, 2022 @01:55PM (#29798510)
There was also this study of Mensa members, but that's probably an extreme outlier group.

https://www.sciencedirect.com/science/article/pii/S016028961...