CONCEPT
The Magical Number Seven
Miller's 1956 discovery that human working memory holds approximately seven items, plus or minus two — the most cited finding in psychological science and the fixed bottleneck through which every human thought must pass.
In 1956, George Miller presented a paper at MIT confessing to being haunted by a number that had followed him across experiments in absolute judgment and immediate memory span. The number was seven. Across studies so methodologically different that no single theory should have connected them, subjects could reliably distinguish or recall approximately seven items. Miller's paper established what would become known as the magical number seven — the capacity limit of human working memory. The discovery was architectural rather than merely quantitative: it revealed a wall inside every human skull that did not yield to intelligence, training, or motivation. Einstein held seven chunks. So did the postal clerk. The bottleneck applied with equal force to every brain that has ever existed, and its universality made it the fixed point around which the entire subsequent history of cognitive science would revolve.
In The You On AI Field Guide
The number's persistence across experimental paradigms was what convinced