Policymakers, business leaders and medical societies are all busy counting metrics like insurance subsidies, premiums and enrollment numbers. These details matter but they miss the larger issue: medicine’s invisible gorilla. getty

In the late 1990s, Harvard psychologists Daniel Simons and Christopher Chabris ran a now-famous experiment. Students watched a short video of six people passing basketballs and were told to count the number of passes made by the three players in white.

Halfway through the film, a person in a gorilla suit walks into the frame, beats its chest and exits. Amazingly, half of viewers — both then and in multiple recreations of the study — never notice the gorilla. They’re so focused on counting passes that they miss the obvious event happening right in front of the

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