 Churchland and Churchland certainly do not restrict talk of “systematic patterns” to patterns generated by an effective method, and this no doubt explains why they think they can assume “with some safety” that what the mind-brain does is computable—since, on their understanding of matters, this is to assume only that the mind-brain exhibits a systematic pattern of responses, or is characterized by a “rule-governed” input-output function (1990: 26). But Turing had no result entailing what the Churchlands say. In fact, he had a result entailing that there are patterns of responses that no standard Turing machine is able to generate. One example of such a pattern is provided by the function h, described earlier.