CONCEPT
Turing Test
Alan Turing's 1950 proposal to replace the unanswerable question "can machines think?" with a testable question about conversational indistinguishability — the most-cited fictional device in the philosophy of AI.
The Turing Test, originally the Imitation Game, was proposed by Alan Turing in his 1950 paper "Computing Machinery and Intelligence." A human judge exchanges text-only messages with two entities — one human, one machine — and tries to determine which is which. If the judge cannot reliably tell them apart, the machine is said to have passed. The test sidesteps metaphysical questions about consciousness and locates intelligence in observable behavior.
In The You On AI Field Guide
For decades the Turing Test functioned as a distant north star: a clear operational definition that no system was close to meeting. With the advent of large language models, the test became suddenly practical — and, many argue, obsolete. Modern LLMs routinely produce conversational output that passes casual Turing-style inspection, yet the field has largely shifted to more specific measures (benchmark suites, task performance, alignment).
The philosophical value of the test remains. It clarifies that behaviorist definitions of intelligence are more tractable than mentalist ones — at