James R. Beebe

We report the results of four empirical studies designed to investigate the extent to which an epistemic closure principle for knowledge is reflected in folk epistemology. Previous work by Turri (2015a) suggested that our shared epistemic practices may only include a source-relative closure principle—one that applies to perceptual beliefs but not to inferential beliefs. We argue that the results of our studies provide reason for thinking that individuals are making a performance error when their knowledge attributions and denials conflict with the closure principle. When we used research materials that overcome what we think are difficulties with Turri’s original materials, we found that participants did not reject closure. Furthermore, when we presented Turri’s original materials to non-philosophers with expertise in deductive reasoning (viz., professional mathematicians), they endorsed closure for both perceptual and inferential beliefs. Our results suggest that an unrestricted closure principle—one that applies to all beliefs, regardless of their source—provides a better model of folk patterns of knowledge attribution than a source-relative closure principle.

The existence of evil and suffering in our world seems to pose a serious challenge to belief in the existence of a perfect God. If God were all-knowing, it seems that God would know about all of the horrible things that happen in our world. If God were all-powerful, God would be able to do something about all of the evil and suffering. Furthermore, if God were morally perfect, then surely God would want to do something about it. And yet we find that our world is filled with countless instances of evil and suffering. These facts about evil and suffering seem to conflict with the orthodox theist claim that there exists a perfectly good God. The challenged posed by this apparent conflict has come to be known as the problem of evil.

The abductivist reply to skepticism is the view that commonsense explanations of the patterns and regularities that appear in our sensory experiences should be rationally preferred to skeptical explanations of those same patterns and regularities on the basis of explanatory considerations. In this article I critically examine Laurence BonJour’s rationalist version of the abductivist position. After explaining why BonJour’s account is more defensible than other versions of the view, I argue that the notion of probability he relies upon is deeply problematic, that he incorporates an implausible double-standard concerning a priori and a posteriori justification, and that his view is vulnerable to skepticism about the a priori. I suggest that some of these problems are due to idiosyncratic commitments BonJour makes and that abductivists would be better off without them. I conclude with some suggestions about how to improve BonJour’s abductivist response to skepticism.

Moral psychologists have recently turned their attention to the study of folk metaethical beliefs. We report the results of a cross-cultural study using Chinese, Polish and Ecuadorian participants that seeks to advance this line of investigation. Individuals in all three demographic groups were observed to attribute objectivity to ethical statements in very similar patterns. Differences in participants’ strength of opinion about an issue, the level of societal agreement or disagreement about an issue, and participants’ age were found to significantly affect their inclination to view the truth of an ethical statement as a matter of objective fact. Implications for theorizing about folk morality are discussed.

According to the thought experiment most commonly used to argue against reliabilism, Mr. Truetemp is given an unusual but reliable cognitive faculty. Since he is unaware of the existence of this faculty, its deliverances strike him as rather odd. Many think that Truetemp would not have justified beliefs. Since he satisfies the reliabilist conditions for justified belief, reliabilism appears to be mistaken. I argue that the Truetemp case is underdescribed and that this leads readers to make erroneous assumptions about Truetemp's epistemic situation. After examining empirical studies of actual subjects who, like Truetemp, have received new perceptual faculties, I show that Truetemp must have been endowed with all of the reorganized neural circuitry and cognitive skills that subjects with new perceptual faculties normally acquire during a long and difficult process of adaptation and development. When readers realize how much more the designers of Truetemp's new faculty had to do than simply slip an artificial device under Truetemp's scalp, I find that they no longer think his beliefs would be unjustified. Because the thought experiment fails to support anti-reliabilist intuitions when further details of the case are made explicit, the Truetemp thought experiment does not constitute a clear and decisive counterexample to reliabilism.

A central topic in experimental epistemology has been the ways that non-epistemic evaluations of an agent’s actions can affect whether the agent is taken to have certain kinds of knowledge. Several scholars have found that the positive or negative valence of an action can influence attributions of knowledge to the agent. These evaluative effects on knowledge attributions are commonly seen as performance errors, failing to reflect individuals’ genuine conceptual competence with knows. In the present article, I report the results of a series of studies designed to test the leading version of this view, which appeals to the allegedly distorting influence of individuals’ motivation to blame. I argue that the data pose significant challenges to such a view.

In a previous article, I argued against the widespread reluctance of philosophers to treat skeptical challenges to oura prioriknowledge of necessary truths with the same seriousness as skeptical challenges to oura posterioriknowledge of contingent truths. Hamid Vahid has recently offered several reasons for thinking the unequal treatment of these two kinds of skepticism is justified, one of which isa prioriskepticism’s seeming dependence upon the widely scornedkkthesis. In the present article, I defenda prioriskepticism against Vahid’s criticisms.