f cognitive science models was encouraged by various factors, including the failure of behaviorism, the invention of the computer, and various theoretical advances, the most important computer science. The father of this field was Turing, a British mathematician who described a simple machine (the Turing machine) that executed instructions in binary code, and proposed that such a machine could perform any computational task. He also described the idea of a universal Turing machine, which takes a coded version of other Turing machines as input and then emulates their behavior.
             The simplest model of a universal computer was also the first. The Turing machine consists of a very long tape, which is marked off into squares. All the squares are the same size, but some of them are marked"1" and some of them are marked "0". In addition to the tape, there is a moving tape head, which can look at one square at a time and determine wheth
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