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/DiggleDootBROPBROPBR]

There's a lot of folks that, again, don't seem to have read the study very well before commenting on it.

The author is using a very specific definition of " irrationality" and attempting to make a statistical argument clarifying certain results in his field of study. Many commenters are conflating his study with various colloquial definitions of irrationality.

These are the two definitions the authors address: “the ability or disposition to resist reporting the response that first comes to mind” “the disposition and ability to think analytically to make decisions that maximize expected utility or follow the laws of probability.”

Note that these DO NOT cover other types of cognitive resistance to new information. There are comments suggesting mental illness, identity-based politics, and emotionally valenced decisions can also explain and contribute to decisions to persist a poor decision. Those ARE NOT addressed in the study.