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Flynn's explanations for this are subtle and varied but one central aspect is a more cognitively demanding modern environment in which people are forced to do counterfactual reasoning to an extent that our grandparents etc. did not. An accessible into to his views are in his TED Talk, where he gives amusing anecdotes about early-20th Century test subject's inability to handle counterfactual reasoning. This inability causes them to score very poorly on IQ tests.
Flynn's argument (TED and elsewhere) DOES NOT imply, however, that our grandfathers were as dumb as their IQ tests suggest. It's obvious, says Flynn, that we are merely better at a skill that IQ tests overvalue for inter-temporal comparisons.
Probably there is a "Flynn Effect" on AHF and in any other forum (real or virtual) in which different age cohorts conduct counterfactual reasoning. As Flynn's research shows, his effect continues to this day: the youngest cohorts in any forum will be most adept at counterfactual reasoning even if - in some more fundamental sense - they are no smarter than the older cohorts.
I want to politely suggest that this predicted dynamic actually plays out on AHF: older members who are impressively knowledgeable about WW2 are not necessarily as adept at counterfactual reasoning. Like the Old World interlocutors that Flynn humorously discusses, they often respond to counterfactual logic problems with rejection that, to someone unacquainted with Flynn's analysis, would suggest they have global cognitive difficulties.
Flynn's studies should remind us (remind me most saliently) not to infer global characteristics from specific lapses in counterfactual reasoning. Likewise, they should remind us of the centrality of counterfactual reasoning to modern modes of analysis.
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