In computer science and the philosophy of artificial intelligence, Blockhead is a famous thought experiment used to argue that the Turing Test is not a sufficient proof of intelligence. Introduced by philosopher Ned Block in 1981, the argument describes a theoretical computer that could pass as human simply by using a massive, pre-programmed "lookup table" of every possible conversation.The Core ArgumentThe "Blockhead" machine is designed to show that a system's internal mechanism matters just as much as its outward behavior.