The mind is a set of specialized modules, not a single general processor

Pinker's central claim is that the brain is not a single all-purpose thinking device but a bundle of specialized subsystems, each shaped by natural selection to handle a particular kind of problem: recognizing objects, parsing grammar, judging faces, tracking social obligations. This is why the mind is brilliant at some tasks (spotting a snake-shaped object in undergrowth) and clumsy at others (probability judgments), because evolution built tools for recurring ancestral problems, not a flexible all-purpose calculator. Pinker borrows the computational theory of mind, treating thought as information processing implemented in neural hardware, and argues this framework explains quirks that a blank-slate view cannot, such as universal fears of snakes and heights despite modern environments rarely presenting them. The modularity view also explains why savants and brain-damaged patients can lose one specific ability, like facial recognition, while other faculties remain untouched, since damage strikes particular circuits rather than a monolithic 'general intelligence.' Takeaway: to explain a mental quirk, ask which ancestral problem the underlying module evolved to solve.