Roy Sorensen

Verisimilitude has the potential to deepen the understanding of mathematical progress, the principle of charity, and the psychology of regret. One obstacle is the widely held belief that two statements can vary in truthlikeness only if they vary in what they entail. This obstacle is removed with four types of counterexamples. The first concerns necessarily coextensive measurements that differ only with respect to their units. The second class of counterexamples is composed of mathematical falsehoods. The third class features inconsistent scientific theories. The fourth class of cases features statements that are instructive but meaningless.

A blindspot is a consistent but inaccessible proposition. For instance, I cannot know 'The test is on Friday but I do not know it'. No contradiction follows from the supposition that you know my blindspot. But could you know my blindspot if we are epistemic peers? Epistemic peers have the same evidence and reasoning ability. So either both peers know a proposition or both are ignorant. Since I cannot know my blindspot, neither can my peer. Thus the formal ignorance associated with blindspots spreads to my peers. This contagion is used to improve a solution to the blindspot solution to the surprise test paradox.

Smartfounding is the opposite of “dumbfounding” introduced by Jonathan Haidt’s research on disgust. Dumbfounders have general competence at thought experiment. However, they are flustered by thought experiments that support repugnant conclusions. Instead of following the supposition wherever it leads, they avoid unsettling implications by adding extraneous information or ignoring stipulated conditions. The dumbfounded commit performance errors, often seeming to regress to the answers of people who lack formal schooling. Smartfounders retain their composure. They practice subversive compliance, obeying the instructions in a way that spoils the aim of the thought experiment. Smartfounders offer a more sophisticated grade of resistance to thought experiment. Whereas the lower grades of resistance are merely fallacious, smartfounding often constitutes a penetrating internal critique of the thought experiment and sometimes of thought experiments in general.

Commanders gain authority from obedience and lose authority from disobedience. We should expect commanders to therefore devise commands that reduce the probability of disobedience. To aid recognition of these techniques for reducing the risk of disobedience, I focus on the extreme of case of commands that reduce the probability to zero. Each of my ten commandments illustrates a logical technique for engineering out disobedience. Once you master these safety measures, you can confidently legislate your own universal maxims. Your innovations will be good news for Immanuel Kant’s characterization of morality in terms of categorical imperatives. The commandments also raise interesting questions about responsibility for necessities and the nature of rule following.

Can merely thinking about an imaginary situation provide evidence for how the world actually is--or how it ought to be? In this lively book, Roy A. Sorensen addresses this question with an analysis of a wide variety of thought experiments ranging from aesthetics to zoology. Presenting the first general theory of thought experiment, he sets it within an evolutionary framework and integrates recent advances in experimental psychology and the history of science, with special emphasis on Ernst Mach and Thomas Kuhn. Sorensen explores what thought experiments are, how they work, and what their virtues and vices are. In his view, philosophy differs from science in degree, but not in kind. For this reason, he claims, it is possible to understand philosophical thought experiments by concentrating on their resemblance to scientific relatives. Sorensen assesses the hazards of thought experiments and grants that there are interesting ways in which the method leads us astray, but attacks most scepticism about thought experiments as arbitrary. He maintains that they should be used--as they generally are--as part of a diversified portfolio of techniques, creating a network of cross-checks that make for impressive reliability.

Stepping into the other guy’s shoes works best when you resemble him. After all, the procedure is to use yourself as a model: in goes hypothetical beliefs and desires, out comes hypothetical actions and revised beliefs and desires. If you are structurally analogous to the empathee, then accurate inputs generate accurate outputs---just as with any other simulation. The greater the degree of isomorphism, the more dependable and precise the results. This sensitivity to degrees of resemblance suggests that the method of empathy works best for average people. The advantage of being a small but representative sample of the population will create a bootstrap effect. For as average people prosper, there will be more average descendants and so the degree of resemblance in subsequent generations will snowball. Each increment in like-mindedness further enhances the reliability and validity of mental simulation. With each circuit along the spiral, there is tighter and tighter bunching and hence further empowerment of empathy. The method is self-strengthening and eventually molds a population of hyper-similar individuals---which partly solves the problem of other minds.

The founder of formalism, Eduard Hanslick compared listening to music to looking through a kaleidoscope. Unlike listening to a story, one can understand music without understanding what it is about. This contrast with language suggests a thought experiment that echoes John Searle′s Chinese Room. Instead of featuring a man who reliably manipulates Chinese symbols without knowing what they represent, consider a man who reliably manipulates sounds . Given formalism, the Turing Test should be an appropriate criterion of musical understanding

A para‐reflection is a privational phenomenon that is often mistaken for a reflection. You have seen them as the ‘reflection’ of your pupil in the mirror. Your iris reflects light in the standard way but your pupil absorbs all but a negligible amount of light (as do other dark things such as coal and black velvet). Para‐reflections work by contrast. Since they are parasitic on their host reflections, para‐reflections are relational and dependent in a way that reflections are not. Nevertheless, para‐reflections obey nearly all the laws of reflection with exquisite fidelity. Para‐refractions display parallel obedience to the laws governing refraction. Physicists and psychologists who study optics have neglected these everyday phenomena. Happily, physicists have been attentive and insightful about other privational phenomena such as vacuums and cold spots. I conclude that this kind of subtle treatment of negative things needs to be extended to optics.1 The invisible red herring2 Mind‐independent privations3 Para‐reflections are mind‐independent4 Parasitical entities5 Para‐refractions and shadows6 How science has coped with privations.

Since 1970, a United States prosecutor can prove perjury without specifying which statement is perjurious. A bold prosecutor could concede ignorance of which statement is false. A bolder prosecutor could further concede that the witness himself does not know. The boldest prosecutor could concede there is no specific lie. Instead of there being a statement that is intrinsically perjurious, the perjury is relational. Just as two statements can be inconsistent without either being inconsistent, two statements can be perjurious without either being perjurious. These consequences are reconciled with the generalisation that all perjury involves lying. Corollaries about culpability are drawn from the phenomenon of nonspecific perjury. The reasoning is generalised to other forms of illegal lying.