In this brief essay, I argue that Anselm's ontological argument for the existence of God achieves its effect through the verbal equivalent of a magician's "sleight-of-hand." More technically, the argument commits the informal fallacy of equivocation. I provide a brief analysis of the argument's text to demonstrate this.

The book I review, _Sleights of Mind_, aims to illuminate properties of perceptual systems by discussing human susceptibility to magical illusions. I describe how the authors use psychological principles to explain two tricks, spoon bending and the Miser's Dream. I also argue that the book is congenial to the following view of illusions: susceptibility to illusion is the result of evolutionary trade-offs; perceptual systems must make assumptions in order to function at all, but susceptibility to illusion is the byproduct of (...) such assumptions. (shrink)

Political candidates often believe they must focus their campaign efforts on a small number of swing voters open for ideological change. Based on the wisdom of opinion polls, this might seem like a good idea. But do most voters really hold their political attitudes so firmly that they are unreceptive to persuasion? We tested this premise during the most recent general election in Sweden, in which a left- and a right-wing coalition were locked in a close race. We asked our (...) participants to state their voter intention, and presented them with a political survey of wedge issues between the two coalitions. Using a sleight-of-hand we then altered their replies to place them in the opposite political camp, and invited them to reason about their attitudes on the manipulated issues. Finally, we summarized their survey score, and asked for their voter intention again. The results showed that no more than 22% of the manipulated replies were detected, and that a full 92% of the participants accepted and endorsed our altered political survey score. Furthermore, the final voter intention question indicated that as many as 48% (69.2%) were willing to consider a left-right coalition shift. This can be contrasted with the established polls tracking the Swedish election, which registered maximally 10% voters open for a swing. Our results indicate that political attitudes and partisan divisions can be far more flexible than what is assumed by the polls, and that people can reason about the factual issues of the campaign with considerable openness to change. (shrink)

A fundamental assumption of theories of decision-making is that we detect mismatches between intention and outcome, adjust our behavior in the face of error, and adapt to changing circumstances. Is this always the case? We investigated the relation between intention, choice, and introspection. Participants made choices between presented face pairs on the basis of attractiveness, while we covertly manipulated the relationship between choice and outcome that they experienced. Participants failed to notice conspicuous mismatches between their intended choice and the outcome (...) they were presented with, while nevertheless offering introspectively derived reasons for why they chose the way they did. We call this effect choice blindness. (shrink)

The central question of the paper is: do women have the right to exclude transwomen from women-only spaces? First I argue that biological sex matters politically, and should be protected legally—at least until such a time as there is no longer sex discrimination. Then I turn to the rationales for women-only spaces, arguing that there are eight independent rationales that together overdetermine the moral justification for maintaining particular spaces as women-only. I address a package of spaces, including prisons, changing rooms, (...) fitting rooms, bathrooms, shelters, rape and domestic violence refuges, gyms, spas, sports, schools, accommodations, shortlists, prizes, quotas, political groups, clubs, events, festivals, and terms. The arguments of these two sections taken together make a strong case against self-identification as the basis for legal sex (because legal sex will generally determine inclusion). In the last part of the paper, I address the objection that my conclusion was obtained through linguistic sleight of hand, which I answer by saying that choices about how to refer to transwomen don’t change the underlying fact that the basis for exclusion is generally sex, not gender identity. (shrink)

Apūrvaṃ vyākaraṇakauśalam ity āstām: “let it remain an example of unprecedented grammatical skill” — thus sarcastically remarks the Dvaitin commentator Jayatīrtha on Śaṅkarācārya’s sleight of hand to turn written saṃbhūti into asaṃbhūti at one of the many difficult turns the Īśa Upaniṣad has in store for his strictly monistic stance. But Jayatīrtha’s own master Madhva is renowned in his own right for his “unprecedented skill” in conjuring up whole unattested smṛti passages to corroborate his interpretations. Indeed, more specimens of (...) “unprecedented skill” are displayed in turn by each of the great bhāṣyakāras of the three conflicting schools — Advaita, Dvaita and Viśiṣṭādvaita — on this Upaniṣad, which on account of its extreme pithiness is singularly suited to demonstrate the length dārśanikas are willing to go to make an authoritative text square each with his own preconceived philosophical outlook. A most telling example of the preemptive force of world-views on actual theoretical practice in the Indian context. (shrink)

A review of Matt Cook's book Sleight of Mind: 75 Ingenious Paradoxes in Mathematics, Physics, and Philosophy.