Sex differences in reproductive strategy and the sexual division of labor resulted in selection for and maintenance of sexual dimorphism across a wide range of characteristics, including body size, hormonal physiology, behavior, and perhaps spatial abilities. In laboratory tasks among undergraduates there is a general male advantage for navigational and mental-rotation tasks, whereas studies find female advantage for remembering item locations in complex arrays and the locations of plant foods. Adaptive explanations of sex differences in these spatial abilities have focused (...) on patterns of differential mate search and routine participation in distinct subsistence behaviors. The few studies to date of spatial ability in nonindustrial populations practicing subsistence lifestyles, or across a wider age range, find inconsistent results. Here we examine sex- and age-based variation in one kind of spatial ability related to navigation, dead-reckoning, among Tsimane forager horticulturalists living in lowland Bolivia. Seventy-three participants (38 male) aged 6–82 years pointed a handheld global positioning system (GPS) unit toward the two nearest communities and the more distant market town. We find no evidence of sex differences in dead reckoning (p = 0.47), nor do we find any evidence of age-related decline in dead-reckoning accuracy (p = 0.28). Participants were significantly more accurate at pointing toward the market town than toward the two nearest villages despite its being significantly farther away than the two nearest communities. Although Tsimane do show sexual dimorphism in foraging tasks, Tsimane women have extensive daily and lifetime travel, and the local environment lacks directional cues that typically enhance male navigation. This study raises the possibility that greater similarity in mobility patterns because of overlapping subsistence strategies and activities may result in convergence of some male and female navigation abilities. (shrink)

C W Evers, J C Walker; Knowledge, Partitioned Sets and Extensionality: a refutation of the forms of knowledge thesis, Journal of Philosophy of Education, Volume.

This article reflects on the author's modest experience as an expert witness in two trials: Osheroff vs. Greenspan (1983), and In the Matter of Baby K (1994). Bioethicists' expertise as scholar-teachers and consultants on particular issues merits qualification by judges as expert witnesses. The article argues that a different kind of expertise – strong moral advocacy – is required to be an effective expert witness. The major lessons of expert witnessing for the author concern the demands and strains on the (...) bioethicist's role as scholar, teacher, and consultant. The Baby K case is analyzed in some detail, due to its importance for bioethics, ethics consultation, and the testimony of bioethicists on either side of the case. Rules of thumb are offered to guide decisions as to choices regarding expert witnessing, as well as a discussion of the interaction of law and bioethics. (shrink)

In his discussion of the ethics of suicide Plato alludes to more than one traditional injunction against it:indicates a fairly general acceptance of its wickedness. Cebes has heard the Pythagorean Philolaus, among others, saying that suicide was immoral, but has gathered no satisfactory explanation as to why this should be so. One reason, impressive, but, Socrates admits, difficult is to be found.

Napolitano (The epistemology of fake news, Oxford University Press, 2021) argues that the Minimalist Account of conspiracy theories—i.e., which defines conspiracy theories as explanations, or theories, about conspiracies—should be rejected. Instead, she proposes to define conspiracy theories as a certain kind of belief—i.e., an evidentially self-insulated belief in a conspiracy. Napolitano argues that her account should be favored over the Minimalist Account based on two considerations: ordinary language intuitions and theoretical fruitfulness. I show how Napolitano’s account fails its own purposes (...) with respect to these two considerations and so should not be favored over the Minimalist Account. Furthermore, I propose that the Minimalist Account is the best conception of ‘conspiracy theory’ if we share Napolitano’s goal of advancing the understanding of conspiracy theories. (shrink)

In his discussion of the ethics of suicide Plato alludes to more than one traditional injunction against it:indicates a fairly general acceptance of its wickedness. Cebes has heard the Pythagorean Philolaus, among others, saying that suicide was immoral, but has gathered no satisfactory explanation as to why this should be so. One reason, impressive, but, Socrates admits, difficult is to be found.

C W Evers, J C Walker; Pyrotechnics Defended: a reply to Jim Mackenzie, Journal of Philosophy of Education, Volume 21, Issue 1, 30 May 2006, Pages 139–142, http.

At the Seventh Congress of German Historians held at Heidelberg in April, 1903, Prof. Eduard Meyer delivered an address on the subject of Augustus, in which he expressed his view that the restitution of the republic was a genuine act of renunciation. ‘Augustus desired to dwell among his fellow-citizens not as a ruler but as a citizen, of course as the first among them all, as the princeps, like Camillus and the Scipios of old.’ If with Mommsen you described the (...) dual control of Caesar and Senate as a Dyarchy you ought not to forget that’ of the two the Senate in theory held complete predominance,1 the Emperor was ‘its executive, or as Tiberius expressed it, its servant, the Senate was the master .’. (shrink)

Professor Cohen makes extensive reference to a lecture “Hypotheses relating to the brain-mind problem” which was published in Nature. He gives a succinct account of the suggestions that I put forward, and then goes on to state that they “illustrate two fallacies which are to be found in so many contributions to the study of the body-mind relationship.” Be that as it may, but Professor Cohen has chosen most unsuitable illustrations, for in both cases they are based on misunderstandings of (...) my article. (shrink)

The female reproductive axis in mammals is a highly complex dynamic system which goes through different transient or absorbent states during the course of a life-time. Little is known about the mechanisms controlling this system during fetal life and at birth, although it has been shown in numerous species, including primates, that the whole machinery is already functioning . After a delay ranging from a few days to a few weeks, according to the species, the reproductive axis becomes quiescent and (...) activity apparently resumes only at the time of puberty. Here again understanding of the phenomenon is still limited. (shrink)

In this article I try to refute the so-called "libertarian" theory of free will, and to examine how our conclusion ought to modify our common attitudes of praise and blame. In attacking the libertarian view, I shall try to show that it cannot be consistently stated. That is, my dscussion will be an "analytic-philosophic" one. I shall neglect what I think is in practice an equally powerful method of attack on the libertarian: a challenge to state his theory in such (...) a way that it will fit in the modern biology and psychology, which are becoming increasingly physicalistic. (shrink)

In Spandrels of Truth, Beall concisely presents and defends a modest, so-called dialetheic theory of transparent truth.

Consequence is at the heart of logic, and an account of consequence offers a vital tool in the evaluation of arguments. This text presents what the authors term as 'logical pluralism' arguing that the notion of logical consequence doesn't pin down one deductive consequence relation; it allows for many of them.

Dr Ian Ramsey has made considerable use of the word ‘disclosure’ in what he has to say about religion and in his attempts to give an account of the meaning of religious language. He sometimes speaks of ‘discernment’ or ‘insight’ but ‘disclosure’ is the word he normally favours. In what follows I shall ask: what a disclosure is, to what extent Dr Ramsey's use of the notion leads to confusions, and what questions have to be faced in order to resolve (...) these confusions. (shrink)

In an article in Philosophy R. G. Swinburne set out to argue that none of Hume's formal objections to the design argument ‘have any validity against a carefully articulated version of the argument’ . This, he maintained, is largely because Hume's criticisms ‘are bad criticisms of the argument in any form’ . The ensuing controversy between Swinburne and Olding 1 has focused upon the acceptable/unacceptable aspects of the dualism presupposed in Swinburne's defence of the design argument; upon whether any simplification (...) is achieved by reducing scientific explanation to agent explanation; and upon the problems which arise from taking a man's acting upon his body as the analogy for understanding a disembodied agent acting upon matter. In this article I shall refer to the Swinburne-Olding controversy when appropriate but my main concern is to return to Swinburne's original article and argue, seriatim , that Hume's individual criticisms of the design argument are for the most part a great deal more powerful than Swinburne allowed. I shall contend that cumulatively they destroy the design argument as any sort of rational foundation for theistic belief. But first I shall indicate briefly the character of the argument together with one or two of the distinctions and refinements in terms of which it has been found helpful to carry on the discussion in recent years. (shrink)

A good argument is one whose conclusions follow from its premises; its conclusions are consequences of its premises. But in what sense do conclusions follow from premises? What is it for a conclusion to be a consequence of premises? Those questions, in many respects, are at the heart of logic (as a philosophical discipline). Consider the following argument: 1. If we charge high fees for university, only the rich will enroll. We charge high fees for university. Therefore, only the rich (...) will enroll. There are many different things one can say about this argument, but many agree that if we do not equivocate (if the terms mean the same thing in the premises and the conclusion) then the argument is valid, that is, the conclusion follows deductively from the premises. This does not mean that the conclusion is true. Perhaps the premises are not true. However, if the premises are true, then the conclusion is also true, as a matter of logic. This entry is about the relation between premises and conclusions in valid arguments. (shrink)

The Liar paradox raises foundational questions about logic, language, and truth (and semantic notions in general). A simple Liar sentence like 'This sentence is false' appears to be both true and false if it is either true or false. For if the sentence is true, then what it says is the case; but what it says is that it is false, hence it must be false. On the other hand, if the statement is false, then it is true, since it (...) says (only) that it is false. -/- How, then, should we classify Liar sentences? Are they true or false? A natural suggestion would be that Liars are neither true nor false; that is, they fall into a category beyond truth and falsity. This solution might resolve the initial problem, but it beckons the Liar's revenge. A sentence that says of itself only that it is false or beyond truth and falsity will, in effect, bring back the initial problem. The Liar's revenge is a witness to the hydra-like nature of Liars: in dealing with one Liar you often bring about another. -/- JC Beall presents fourteen new essays and an extensive introduction, which examine the nature of the Liar paradox and its resistance to any attempt to solve it. Written by some of the world's leading experts in the field, the papers in this volume will be an important resource for those working in truth studies, philosophical logic, and philosophy of language, as well as those with an interest in formal semantics and metaphysics. (shrink)