Is the Brain a Digital Computer

I will be addressing 1 and not 2 or 3. I think 2 can be decisively answered in the negative. Since programs are defined purely formally or syntactically and since minds have an intrinsic mental content, it follows immediately that the program by itself cannot constitute the mind. The formal syntax of the program does not by itself guarantee the presence of mental contents. I showed this a decade ago in the Chinese Room Argument (Searle,1980). A computer, me for example, could run the steps in the program for some mental capacity, such as understanding Chinese, without understanding a word of Chinese. The argument rests on the simple logical truth that syntax is not the same as, nor is it by itself sufficient for, semantics. So the answer to the second question is obviously "No".

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