Hugo Mercier and Dan Sperber's The Enigma of Reason advances one of the most consequential arguments in contemporary cognitive science: that human reasoning did not evolve to find truth, but to win arguments. Their "interactionist" theory proposes that reason evolved primarily as a social tool — to produce justifications for our own actions and to evaluate the arguments of others — rather than as a mechanism for individual belief formation. This explains a long-standing puzzle: why humans are so systematically bad at reasoning when alone, but often so effective when arguing in groups.
The implications for the information environment are profound. If reasoning is fundamentally a social activity oriented towards persuasion rather than truth-finding, then the standard counter-disinformation model — expose people to correct information and let their reason do the rest — is built on a false premise. People reason to justify what they already believe; they are skilled at finding flaws in arguments they dislike and blind to flaws in arguments they favour. Understanding this is essential for designing effective interventions: the goal is not to provide better information but to change the social environment in which reasoning occurs. One of the most important books in the field, and one that practitioners consistently underestimate.
Cogitavi commentary
Hugo Mercier and Dan Sperber's The Enigma of Reason advances one of the most consequential arguments in contemporary cognitive science: that human reasoning did not evolve to find truth, but to win arguments. Their "interactionist" theory proposes that reason evolved primarily as a social tool — to produce justifications for our own actions and to evaluate the arguments of others — rather than as a mechanism for individual belief formation. This explains a long-standing puzzle: why humans are so systematically bad at reasoning when alone, but often so effective when arguing in groups.
The implications for the information environment are profound. If reasoning is fundamentally a social activity oriented towards persuasion rather than truth-finding, then the standard counter-disinformation model — expose people to correct information and let their reason do the rest — is built on a false premise. People reason to justify what they already believe; they are skilled at finding flaws in arguments they dislike and blind to flaws in arguments they favour. Understanding this is essential for designing effective interventions: the goal is not to provide better information but to change the social environment in which reasoning occurs. One of the most important books in the field, and one that practitioners consistently underestimate.