In his book, The Scientific Image, van Fraassen lucidly draws an alternative to scientific realism, which he calls "Constructive Empiricism". In this epistemological theory, the concept of observability plays the pivotal role: acceptable theories may be believed only where what they say solely concerns observables. Van Fraassen develops a concept of observability which is, as he admits, vague, relative, science-dependent, and anthropocentric. I draw out unacceptable consequences of each of these aspects of his concept. Also, I argue against his assumption (...) that "empirical adequacy" is the same thing as "saving the phenomena", according to his sense of the expressions. (shrink)

There is no problem more paradigmatically philosophical than the mind-body problem. Nevertheless, I will argue that the problem is empirical. I am not even suggesting that conceptual analysis of the various mind-body theories be abandoned – just as I could not suggest it be abandoned for theories in physics or biology. But unlike the question, ‘Is every even number greater than 2 equal to the sum of two primes?’ the mind-body problem cannot be solved a priori, by analysis alone; though (...) I will not argue this thesis here, it is nearly obvious, since purported solutions must make matter of fact claims, heavy with existential import, about the real world. By contrast, an investigation of the sensitivity of the mind-body problem to empirical evidence will show that purported solutions to the problem are empirically testable, to a degree consistent with philosophy giving a clarified mind-body problem to the sciences. I offer the bold outlines of such an investigation here. (shrink)

The cerebral cortex is a rich and diverse structure that is the basis of intelligent behavior. One of the deepest mysteries of the function of cortex is that neural processing times are only about one hundred times as fast as the fastest response times for complex behavior. At the very least, this would seem to indicate that the cortex does massive amounts of parallel computation.This paper explores the hypothesis that an important part of the cortex can be modeled as a (...) connectionist computer that is especially suited for parallel problem solving. The connectionist computer uses a special representation, termed value unit encoding, that represents small subsets of parameters in a way that allows parallel access to many different parameter values. This computer can be thought of as computing hierarchies of sensorimotor invariants. The neural substrate can be interpreted as a commitment to data structures and algorithms that compute invariants fast enough to explain the behavioral response times. A detailed consideration of this model has several implications for the underlying anatomy and physiology. (shrink)

Suppose we are able to transplant Jones's pain centres into Smith's brain. Half way through the operation we test the pain centres by stimulating them electrically in vitro. Would there be pain? Roland Puccetti argues that there would not be. Because pains must have owners and the only available candidate for that role — the excised tissue — is logically unfit to play it. He concludes that the firing of such centres in a normally functioning brain cannot be pain either (...) and that, therefore, materialism is false.So far as I can see, Puccetti's “refutation” is a series of nonsequiturs from start to finish, and that is what I mainly want to show. It will not follow, of course, that materialism is true. Indeed, I think the view which Puccetti attacks under that name is too naive to be taken seriously by anyone. (shrink)