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There is another possible causation: people with mental disorders tend to have high IQ (whatever it is that IQ actually measures).

The blind typically have incredible touch for reading Braille. Some also have incredible hearing. These are not physiological benefits that they get at birth; their coping mechanisms train them.

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Well, i don't know about specific disorders, but mental health declines rapidly with lower intelligence.

The most mentally unhealthy people are the ones that are on the lower end, but still within what we expect to function in society.

Source sadly not being verifiable since it is my psychologist wife that works with mental health in school with intelligence testing and extra resources to help those who need it.

That's an individual experience, not scientific proof. An experience limited to school kids of a certain age and location who share their problems with your wife.

No. She cited what was taught during her studies (she got her license 3 years ago, so the studies have all been within the last 10 years). According to what she was taught, Most mental illnesses correlate positively with lower IQ (apart from neurodevelopmental disorders, which this study measured, and bipolar disease).

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