ELIZA: The 1966 Chatbot Its Own Inventor Warned Us About

In the mid-1960s at MIT, a secretary tried a computer program called ELIZA and asked her boss, the man who wrote it, to leave the room. Here's how the first famous chatbot actually worked (a few simple rules and your own words handed back), what that story really says, why its inventor Joseph Weizenbaum spent the rest of his life warning us about it, and why the "ELIZA effect" still works on us today. Chapters 0:00 The secretary who asked her boss to leave 0:27 Turing's game, 1950 0:55 Dartmouth names a field, 1956 1:40 Joseph Weizenbaum builds ELIZA 2:08 How the trick worked 2:38 The real 1966 conversation 3:26 "Would you mind leaving the room?" 4:07 What the record actually says 4:48 The ELIZA effect 5:28 Computer Power and Human Reason 5:57 Big promises and AI winters 6:18 ELIZA finally takes the Turing test 6:59 What it means for today's chatbots Sources Weizenbaum, J., 1966, "ELIZA: A Computer Program for the Study of Natural Language Communication between Man and Machine", Communications of the ACM 9(1): https://doi.org/10.1145/365153.365168 Weizenbaum, J., 1967, "Contextual Understanding by Computers", Communications of the ACM 10(8) (the secretary anecdote, p. 477-478) Weizenbaum, J., 1976, Computer Power and Human Reason: From Judgment to Calculation, W. H. Freeman Turing, A. M., 1950, "Computing Machinery and Intelligence", Mind 59(236): https://doi.org/10.1093/mind/LIX.236.433 McCarthy, Minsky, Rochester & Shannon, 1955, A Proposal for the Dartmouth Summer Research Project on Artificial Intelligence: https://www-formal.stanford.edu/jmc/h... Hertog, J., "The Birth of Artificial Intelligence", Dartmouth Alumni Magazine: https://dartmouthalumnimagazine.com/a... Berry, D. M. & Ciston, S., 2024, "Weizenbaum's Secretary", ELIZA Archaeology Project: https://sites.google.com/view/elizaar... Roach, R., 2024, "My search for the mysterious missing secretary who shaped chatbot history", The Conversation: https://theconversation.com/my-search... 99% Invisible, 2019, Episode 382 "The ELIZA Effect" (transcript with archival Weizenbaum audio and Miriam Weizenbaum): https://99percentinvisible.org/episod... Silverman, J., 2024, "The Inventor of the Chatbot Tried to Warn Us About A.I.", The New Republic: https://newrepublic.com/article/18118... Hofstadter, D., 1995, Fluid Concepts and Creative Analogies, "The Ineradicable Eliza Effect and Its Dangers" Colby, Watt & Gilbert, 1966, "A computer method of psychotherapy: preliminary communication", Journal of Nervous and Mental Disease 142(2): https://pubmed.ncbi.nlm.nih.gov/5936301 Lighthill, J., 1973, Artificial Intelligence: A General Survey, Science Research Council Crevier, D., 1993, AI: The Tumultuous History of the Search for Artificial Intelligence, Basic Books Haigh, T., 2023, "There Was No 'First AI Winter'", Communications of the ACM 66(12): https://doi.org/10.1145/3625833 Jones, C. R. & Bergen, B. K., 2025, "Large Language Models Pass the Turing Test", arXiv preprint: https://arxiv.org/abs/2503.23674 Lane, R. et al., 2025, "ELIZA Reanimated", arXiv: https://arxiv.org/abs/2501.06707 The skits are dramatized; ELIZA's lines in them are real lines from the 1966 DOCTOR script, and the transcript is quoted from Weizenbaum's 1966 paper. #history #ai #chatbot