In the early 1970s Stanford psychologist David Rosenhan told a psychiatric hospital he heard a voice saying thud. Inspired by a lecture from R.D. Laing, he described eight healthy pseudopatients who claimed to hear words like empty, hollow, and thud at 12 hospitals in five states. All were admitted, seven with schizophrenia, then held for 7 to 52 days despite acting normally. Staff logged note taking as abnormal writing behavior, doctors spent an average of 6.8 minutes a day with patients, and discharge files read schizophrenia in remission. His 1973 paper in Science, On Being Sane in Insane Places, fueled deinstitutionalization.

Psychiatrists Robert Spitzer and Seymour Kety fought back, with Kety comparing it to swallowing blood and faking an ulcer. Decades later, journalist Susannah Cahalan’s 2019 book The Great Pretender found fabricated quotes and could identify only two of the eight pseudopatients. Rosenhan’s own intake records showed he reported insomnia, suicidal thoughts, and sensitivity to radio signals, not just one word. In 2023 Andrew Scull called the study a successful scientific fraud, and a 2024 study found only a small first impression bias among therapists.

• Why 35 of 118 real patients suspected the pseudopatients were faking while staff did not
• Hidden pills flushed down toilets and the conditions inside 1970s wards
• The challenge from a teaching hospital that flagged 41 of 193 patients as impostors when Rosenhan had sent none
• Labeling theory and how a diagnosis reframed ordinary behavior
• A graduate student pseudopatient whose memories contradicted the published account