For most of the 20th century, intelligence research took place, quite literally, in a room with a stopwatch. What could be measured cleanly, like the accuracy of an analogy, the speed of a mental rotation, or the ability to complete a numerical sequence, became, almost by default, what psychologists meant when they said someone was intelligent.

It was never really a philosophical claim that reasoning under artificial time pressure was the truest expression of a mind. It was simply the portion of the mind that happened to fit inside a testing booklet and was easy to score and easy to compare across large groups of people. The rest of what makes someone capable in the world had nowhere convenient to be scored. This included the skills like reading a tense negotiation correctly, sensing when persistence will pay off and when it will only do damage, or recovering smoothly from a public misstep without compounding it. For a long time, it was treated as something softer and vaguer, adjacent to intelligence rather than a genuine part of it.

Anyone who has spent time in a demanding workplace has watched this distinction play out in a fairly unglamorous, everyday way. A newly credentialed professional, immaculate on paper, freezes the first time a routine situation goes sideways in some minor, unscripted manner. Meanwhile, a colleague with a far less decorated résumé is the one everyone defers to when a client is upset, a plan has fallen apart, or a decision has to be made with half the relevant information missing.........

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