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⚙️IEEE Spectrum AI
July 15, 2026
General AI

The First Chatbot's Multiple Personalities

Overview

ELIZA is remembered as the world's first AI star, a kindly therapist in chatbot form that gently probed users' worries. Even its creator, Joseph Weizenbaum, was surprised by the warm reception given to his experiment in human-machine interaction. For some, it heralded an age of automated psychotherapy, while others believed the program demonstrated sentience, a fallacy soon known as the "ELIZA effect.

Key Takeaways

  • " Based on published descriptions, ELIZA has been implemented on many different computers, but only recently has the actual source code been unearthed from MIT's archives .

    In Inventing ELIZA: How the First Chatbot Shaped the Future of AI , just published by MIT Press , a squad of researchers analyze the code and reveal a complex program capable of much more than faking psychiatry.

  • As the first chatbot, ELIZA demonstrated how a calculation machine might engage in conversation, ushering in a host of social and technical questions that still resonate today.

    Now we don't think twice about interacting with a machine in real time, conversing over text, or even speaking into the air to ask about the weather.

  • Although ELIZA was far from a faultless conversation partner, it astonished its users.

    The recent discovery and archaeology of the original ELIZA source code represents a significant intervention in the history of computing.

  • Yet, like a modern chatbot prompted to behave with different personalities, ELIZA could take on many roles.

    reveal underlying assumptions about language, therapy, and human-computer interaction that continue to influence modern AI development.

  • This code and script do not merely showcase programming techniques of the 1960s; they reveal underlying assumptions about language, therapy, and human-computer interaction that continue to influence modern AI development.
The First Chatbot's Multiple Personalities

" Based on published descriptions, ELIZA has been implemented on many different computers, but only recently has the actual source code been unearthed from MIT's archives . In Inventing ELIZA: How the First Chatbot Shaped the Future of AI , just published by MIT Press , a squad of researchers analyze the code and reveal a complex program capable of much more than faking psychiatry. In fact, it could assume several different personas.

The authors have also created a faithful emulation of the therapist persona that you can try yourself after reading the book excerpt below. W hen it debuted in the mid-1960s, the ELIZA software program transformed the way people thought about interacting with computers. As the first chatbot, ELIZA demonstrated how a calculation machine might engage in conversation, ushering in a host of social and technical questions that still resonate today.

Now we don't think twice about interacting with a machine in real time, conversing over text, or even speaking into the air to ask about the weather. In many ways, ELIZA shaped not only the way we think about interacting with computers but also how we think about them. It began to give a reality to the science fiction stories of how we expect computers to work.

For more details please read the original article at IEEE Spectrum AI.

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Originally published by IEEE Spectrum AI
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