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PARRY showed early on that conversational agents with simulated internal belief systems could successfully mimic specific behavioural patterns to the point of passing specialised Turing tests.
Unlike ELIZA, which relied primarily on surface-level keyword reflection, PARRY implemented an underlying cognitive model that tracked beliefs and conversational strategies. The fact that trained psychiatrists could not reliably differentiate PARRY's responses from those of human patients highlighted both the efficacy of domain-specific behavioural simulation and the pitfalls of using conversational indistinguishability as a metric for intelligence.
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