Twin study suggests rationality and intelligence share the same genetic roots - the study suggests that being irrational, or making illogical choices, might simply be another way of measuring lower intelligence.

[u/mvea]

https://www.psypost.org/twin-study-suggests-rationality-and-intelligence-share-the-same-genetic-roots/

[u/Limemill]

I agree. But also in general, rationality is the ability to look past one’s cognitive biases, which is emotional in nature. Emotions come first and intelligence tries to rationalize them away later. So, in the case of high-IQ individuals what I tend to observe more often than not is much more sophisticated justifications of pre-existing emotional biases, not a lack of said biases. The ability to challenge one’s identity with its emotional reactions, which can be soul-shattering and utterly depressing, is not something I’d attribute to intelligence. It’s a different skill / value altogether, it seems