Page 107 - Foundations of Cognitive Psychology : Core Readings

108 John R. Searle

be duplication. The distinction between the program and its realization in the
hardware seems to be parallel to the distinction between the level of mental
operations and the level of brain operations. And if we could describe the level
of mental operations as a formal program, then it seems we could describe
what was essential about the mind without doing either introspective psychol-
ogy or neurophysiology of the brain. But the equation, ‘‘mind is to brain as
program is to hardware’’ breaks down at several points, among them the fol-
lowing three:
First, the distinction between program and realization has the consequence
that the same program could have all sorts of crazy realizations that had no
form of intentionality. Weizenbaum (1976; ch. 2), for example, shows in detail
how to construct a computer using a roll of toilet paper and a pile of small
stones. Similarly, the Chinese story understanding program can be programmed
into a sequence of water pipes, a set of wind machines, or a monolingual English
speaker, none of which thereby acquires an understanding of Chinese. Stones,
toilet paper, wind, and water pipes are the wrong kind of stuff to have inten-
tionality in the first place—only something that has the same causal powers as
brains can have intentionality—and though the English speaker has the right
kind of stuff for intentionality you can easily see that he doesn’t get any extra
intentionality by memorizing the program, since memorizing it won’t teach
him Chinese.
Second, the program is purely formal, but the intentional states are not in
that way formal. They are defined in terms of their content, not their form. The
belief that it is raining, for example, is not defined as a certain formal shape,
but as a certain mental content with conditions of satisfaction, a direction of fit
(see Searle, 1979b), and the like. Indeed the belief as such hasn’t even got a
formal shape in this syntactic sense, since one and the same belief can be given
an indefinite number of different syntactic expressions in different linguistic
systems.
Third, as I mentioned before, mental states and events are literally a product
of the operation of the brain, but the program is not in that way a product of
the computer.
‘‘Well if programs are in no way constitutive of mental processes, why have
so many people believed the converse?That at least needs some explanation.’’
I don’t really know the answer to that one. The idea that computer simu-
lations could be the real thing ought to have seemed suspicious in the first
place because the computer isn’t confined to simulating mental operations, by
any means. No one supposes that computer simulations of a five-alarm fire will
burn the neighborhood down or that a computer simulation of a rainstorm will
leave us all drenched. Why on earth would anyone suppose that a computer
simulation of understanding actually understood anything?It is sometimes
said that it would be frightfully hard to get computers to feel pain or fall in
love, but love and pain are neither harder nor easier than cognition or anything
else. For simulation, all you need is the right input and output and a program
in the middle that transforms the former into the latter. That is all the computer
has for anything it does. To confuse simulation with duplication is the same
mistake, whether it is pain, love, cognition, fires, or rainstorms.