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Extremist brains perform poorly in complex mental tasks and analysis shows that
(www.sciandnature.com)
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I agree the journalist and arguably the researchers themselves are representing these results poorly.
Participants across the studies were evaluated on their likely hood to die for the in-group or kill the outgroup. The groups in question appear to be nationality. So "Extreme ideology" is better read as "extreme nationalism" imho.
The finding is, as you said, more rigid cognition. Less lateral thinking. Not "extremists are dumb", which is a feel good line that undermines the threat of certain extremists.
I really want to give the benefit of the doubt and assume there was a followup study with the things the article brings into the discussion: liberal vs conservative thought patterns, or cognitive inflexibility correlating to poor analytical ability.
But I have no idea and wasn't invested enough to do more than google "zmigrod extremism study" honestly.