1939: Sigmund Freud dies

On 23 September 1939, Sigmund Freud, the founder of psychoanalysis, died in London at the age of 83. Having fled Nazi-occupied Vienna the previous year, Freud spent his final days in exile, continuing to refine his theories of the human mind even as cancer took its toll.

Freud’s revolutionary idea was that much of mental life operates outside conscious awareness. Through concepts such as the unconscious, repression, and the dynamic interplay of id, ego and superego, he offered a model of intelligence that was neither purely rational nor purely behavioural. His case studies and the talking cure treated the mind as a system that could be analysed, interpreted and, to some extent, reprogrammed.

Though psychoanalysis later diverged from experimental psychology, Freud’s insistence on internal mental structure helped clear the ground for the cognitive revolution of the 1950s. Researchers who built the first AI programs—Allen Newell, Herbert Simon and others—shared Freud’s conviction that intelligence involves hidden processes that can be made explicit through careful observation and modelling. Protocol analysis, in which subjects think aloud while solving problems, echoes the free-association method in spirit if not in theory.

The thread continues into contemporary artificial intelligence. Modern machine-learning systems often behave like black boxes whose internal representations are opaque even to their creators—an “unconscious” of weights and activations. Debates about AI bias, explainability and machine consciousness frequently revive Freudian language: what does a neural network “repress”? Can an artificial agent have something like an ego ideal? While few AI engineers read Freud today, the deeper project of rendering the mind transparent and programmable still carries his imprint.

Thus the anniversary of Freud’s death reminds us that the quest to understand and eventually replicate intelligence has always drawn on attempts to map the hidden architecture of thought.