David Papineau

By way of an example, Lewis imagines your being invited to join Schrödinger’s cat in its box for an hour. This box will either fill up with deadly poison fumes or not, depending on whether or not some radioactive atom decays, the probability of decay within an hour being 50%. The invitation is accompanied with some further incentive to comply (Lewis sets it up so there is a significant chance of some pretty bad but not life-threatening punishment if you don’t get in the box). Lewis argues that the many minds theory implies that you should get in the box with the cat, despite this making it 50% likely you will die.

On the Friday afternoon of the 3 rd test at Trent Bridge in 2001, the series was in the balance. The Australians had won the first two tests easily, but England now found themselves in a position of some strength. They had restricted Australia to a first-innings lead of just 5 runs, and had built a lead of 120 with six wickets in hand. Mark Ramprakash was in and had been batting steadily for well over an hour. Even though this Australian side was as strong as any in cricket history, England had real hopes of getting back into the series

I argue that philosophy is like science in three interesting and non-obvious ways. First, the claims made by philosophy are synthetic, not analytic: philosophical claims, just like scientific claims, are not guaranteed by the structure of the concepts they involve. Second, philosophical knowledge is a posteriori, not a priori: the claims established by philosophers depend on the same kind of empirical support as scientific theories. And finally, the central questions of philosophy concern actuality rather than necessity: philosophy is primarily aimed at understanding the actual world studied by science, not some further realm of metaphysical modality.

Who would have thought it? Poker has become a mass-audience spectator sport. Names like Chris ‘Jesus’ Ferguson, Phil ‘Unabomber’ Laak, and Dave ‘The Devilfish’ Ulliott may not be familiar to all readers of the TLS, but on any normal night you can see these top poker professionals on the nether reaches of the satellite channels, as they bluff and bully their way to pots worth hundreds of thousands of dollars. Like their counterparts in tennis and golf, they tour the world, playing in lucrative tournaments which are avidly followed on television by millions of amateur enthusiasts whose own poker experience is mostly limited to small-stakes games played with faceless strangers on internet poker sites.

The main puzzle about theoretical definitions is that nothing seems to decide which assumptions contribute to such definitions and which do not. I argue that theoretical definitions are indeed imprecise, but that this does not normally matter, since the definitional imprecision does not normally produce indeterminacy of referential value. Sometimes, however, the definitional imprecision is less benign, and does generate referential indeterminacy. In these special cases, but not otherwise, it is necessary to refine the term's definition

I agree with nearly everything Martin Davies says. He has written an elegant and highly informative analysis of recent philosophical debates about the mind–brain relation. I particularly enjoyed Davies’ discussion of B.A. Farrell, his precursor in the Oxford Wilde Readership (now Professorship) in Mental Philosophy. It is intriguing to see how closely Farrell anticipated many of the moves made by more recent ‘type-A’ physicalists who seek to show that, upon analysis, claims about conscious states turn out to be nothing more than complex third-personal claims about internal and external behaviour. Davies is also exemplary in his even-handed treatment of those contemporary ‘type-B’ physicalists who have turned away from the neo-logical-behaviourism of Farrell and his ilk. Davies explains how type-B physicalists recognize distinctive subjective ‘phenomenal concepts’ for thinking about conscious states and so deny that phenomenal claims can be deduced a priori from behavioural or other third-personal claims. However, type-B physicalists do not accept that these subjective phenomenal concepts refer to any distinct non-material reality. In their view, phenomenal concepts and third-personal scientific concepts are simply another example of the familiar circumstance where we have two different ways of referring to a single reality. Since I am persuaded by pretty much all Davies says about these matters, I shall not comment substantially on the dialectical points he covers. Instead I want to raise two rather wider issues. The first is the set of ideas associated with the phrase ‘the explanatory gap’. Davies specifies that he is using this phrase in a specific technical sense. But the phrase has further connotations, and this can lead to a distorted appreciation of the philosophical issues. The second issue is the methodological implications of the philosophical debate. I shall argue that the philosophical issues addressed by Davies suggest that there are unexpected limitations on what empirical brain research can achieve..

Why is there a cognitive gulf between other animals and humans? Current fashion favours our greater understanding of Theory of Mind as an answer, and Language is another obvious candidate. But I think that analysis of the evolution of means-end cognitive mechanisms suggests that there may be a further significant difference: where animals will only perform those means which they (or their ancestors) have previously used as a route to some end, humans can employ observation to learn that some novel means is a route to a desired end. In short, human can learn from observation, where animals can learn only from first-hand experience.