Saving the Truth Schema from Paradox

The paper shows how we can add a truth predicate to arithmetic (or formalized syntactic theory), and keep the usual truth schema Tr(A)A (understood as the conjunction of Tr(A)A and ATr(A)). We also keep the full intersubstitutivity of Tr(A)) with A in all contexts, even inside of an . Keeping these things requires a weakening of classical logic; I suggest a logic based on the strong Kleene truth tables, but with as an additional connective, and where the effect of classical logic is preserved in the arithmetic or formal syntax itself. Section 1 is an introduction to the problem and some of the difficulties that must be faced, in particular as to the logic of the ; Section 2 gives a construction of an arithmetically standard model of a truth theory; Section 3 investigates the logical laws that result from this; and Section 4 provides some philosophical commentary.     

Epistemic curiosity and self-regulation

Relationships between Interest (I) and Deprivation (D) type epistemic curiosity (EC) and self-regulation were evaluated in two studies. In Study 1 (Italians, N = 151), I-type EC correlated positively with positive outcome-expectancies and risk-taking, but negatively with thinking about negative outcomes. D-type EC correlated positively with emotional restraint, thoughtful evaluation, and concern over negative outcomes and potential risks. In Study 2 (Americans, N = 218; Germans, N = 56), I-type EC correlated positively with behavioral activation, especially fun seeking, whereas D-type correlated negatively with fun seeking. Neither EC scale correlated significantly with behavioral inhibition. These findings suggest that I-type EC corresponds to fun, carefree and optimistic approaches to learning, while D-type EC reflects greater thoughtfulness and caution regarding knowledge-search.     

Theorizing about the epistemic

I argue that epistemologists’ use of the term ‘epistemic’ has led to serious confusion in the discussion of epistemological issues. The source of the problem is that ‘epistemic’ functions largely as an undefined technical term. I show how this confusion has infected discussions of the nature of epistemic justification, epistemic norms for evidence gathering, and knowledge norms for assertion and belief.     

The epistemic innocence of psychedelic states

One recent development in epistemology, the philosophical study of knowledge, is the notion of ‘epistemic innocence’ introduced by Bortolotti and colleagues. This concept expresses the idea that certain suboptimal cognitive processes may nonetheless have epistemic (knowledge-related) benefits. The idea that delusion or confabulation may have psychological benefits is familiar enough. What is novel and interesting is the idea that such conditions may also yield significant and otherwise unavailable epistemic benefits. I apply the notion of epistemic innocence to research on the transformative potential of psychedelic drugs. The popular epithet ‘hallucinogen’ exemplifies a view of these substances as fundamentally epistemically detrimental. I argue that the picture is more complicated and that some psychedelic states can be epistemically innocent. This conclusion is highly relevant to policy debates about psychedelic therapy. Moreover, analysing the case of psychedelics can shed further light on the concept of epistemic innocence itself.     

Common-sense reasoning as proto-scientific agent activity

We wish to model common-sense reasoning in situations where it contains some of the ingredients typical of proto-scientific reasoning, with a view to future elaboration and proof of concept. To model this proto-scientific narrative, we employ the integrative formal computational machinery we have been developing and implementing for rational cooperative epistemic agents. In our logic-based framework, agents can update their own and each other's theories, which are comprised of knowledge, active rules, integrity constraints, queries, abducibles, and preferences; they can engage in abductive reasoning involving updatable preferences; set each other queries; react to circumstances; plan and carry out actions; and revise their theories and preferences by means of concurrent updates on self and others.     

Philosophical foundations of partial belief models

This paper is an attempt to put forward a new kind of partial model for representing belief states. I first introduce some philosophical motivations for working with partial models. Then, I present the standard (total) model proposed by Hintikka, and the partial models studied by Humberstone and Holliday. I then show how to reduce Hintikka’s semantics in order to obtain a partial model which, however, differs from Humberstone’s and Holliday’s. The nature of such differences is assessed, and I provide motivations for using the newly proposed semantics rather than the existing ones. Finally, I review some promising philosophical applications of the ideas developed throughout the discussion.     

Black magic and respecting persons—Some perplexities

Black magic (henceforth BM) is acting in an attempt to harm human beings through supernatural means. Examples include the employment of spells, the use of special curses, the burning of objects related to the purported victim, and the use of pins with voodoo dolls. For the sake of simplicity, we shall focus on attempts to kill through BM. The moral attitude towards BM has not been, as far as we know, significantly discussed in contemporary analytic philosophy. Yet the topic brings up interesting questions and poses challenges, occasionally even reaching the level of paradoxes. Ideas of respecting persons, in particular, will be seen to be challenged by this form of magic. The notion of respecting persons will be treated here broadly and pluralistically. Indeed part of the interest in the discussion will be the unfolding of the diverse ways in which this term should be understood, and the contrasts between its various uses. Often, as we shall see, respect for persons and disrespect for them, in different senses, will co-exist, and the dilemma will be one where avoiding some forms of disrespect will involve us in disrespect in other senses.     

Objective and epistemic gradability: Is the new angle on the Knobe effect empirically grounded?

According to the New Angle, any explanation of the Knobe effect must be gradable and asymmetric. It has been argued that only Hindriks’ approach meets both criteria. First, we argue that Holton’s hypothesis also meets the criteria. Second, we show that the authors are not justified in taking the criteria to be empirically justified. We have failed to replicate the asymmetry result in two experiments. Moreover, gradability can be objective or epistemic. We show that the New Angle presupposes objective gradability. In our experiments, the patterns of responses to questions about epistemic and objective gradability are the same, irrespective of whether the feature is objectively gradable (e.g., blameworthiness) or not (e.g., intentionality). Our results thus question the extent to which the New Angle is empirically grounded. Moreover, they raise doubt whether the answers to questions about epistemic and objective gradability can be taken at face value at all.

Abbreviations: NRH - normative reasons hypothesis; NVH - norm violation hypothesis; DQ - degree question; DAQ - degree of agreement question     

Measuring inaccuracy of uncertain doxastic states in many-valued logical systems

I will propose an alternative philosophical approach to the representation of uncertain doxastic states. I will argue that the current account of measuring inaccuracy of uncertain doxastic states is inadequate for Belnap's four-valued logic. Specifically, a situation can be found in which either an inaccuracy measure returns a completely wrong result or an agent's inaccuracy score is inadequate relative to the mistake in her doxastic attitude. This will motivate an alternative representation of uncertain doxastic states based on ordered pairs. I will describe a possible inaccuracy measure that is suitable for ordered pairs, and I will show that it has all the qualities that are required for an inaccuracy measure to be legitimate. Finally, I will introduce conditions of rationality for uncertain doxastic states represented by ordered pairs.     

Who am I? The interactive effect of early family experiences and self-esteem in predicting self-clarity

Previous research suggests that inconsistencies between self-esteem and social feedback reduce feelings of coherence. The current research tested effects of discrepancies between people’s self-esteem and feedback they received in the form of chronic early family experiences. In two studies, participants completed measures of global self-esteem, perceived early family experiences, and self-clarity. Early family experiences that were inconsistent with participants’ current self-views (i.e., negative experiences for high self-esteem, positive experiences for low self-esteem) were associated with lower self-clarity; in contrast, consistent experiences were associated with higher self-clarity. These findings have implications for understanding the development of self-clarity and suggest novel consequences of early family experiences.