I will propose a minimal logic for interactive epistemology based on a qualitative representation of epistemic individual and group attitudes including knowledge, belief, strong belief, common knowledge and common belief. I will show that the logic is sufficiently expressive to provide an epistemic foundation for various game-theoretic notions and solution concepts such as strong and weak domin...

In this paper I discuss the relation between various properties that have been regarded as important for determining whether or not a belief constitutes a piece of knowledge: its stability, strength and sensitivity to truth, as well as the strength of the epistemic position in which the subject is with respect to this belief. Attempts to explicate the relevant concepts more formally with the he...

In this paper we explore the topological semantics for conditional logic that arises from the Alexandroff equivalence between preorders and topological spaces. This clarifies the relation between the standard order semantics and premise semantics for conditionals. As an application we provide a construction of relative similarity orders between possible worlds from topologies of relevant propos...

I consider a logical framework for modeling uncertainty based on the use of possible worlds that incorporates knowledge probability and time This turns out to be a powerful approach for modeling many problems of interest I show how it can be used to give insights into among other things several well known

A central result in the AGM framework for belief revision is the construction of revision functions in terms of total preorders on possible worlds. These preorders encode comparative plausibility: r ă r1 states that the world r is at least as plausible as r1. Indifference in the plausibility of two worlds, r, r1, denoted r „ r1, is defined as r ⊀ r1 and r1 ⊀ r. Herein we take a closer look at p...

I was surprised to see your trashing of a recent paper in Psych Science, and even more surprised to discover that you didn’t contact the authors of the paper before you publically leveled charges of sloppiness and stupidity (if not dishonesty) against them. It is really quite shameful. I was glad to see that they posted a thoughtful and temperate response on their website, though sad that it wo...

Divorced women, who had been married for an average of 22 years, wrote narrative descriptions of their best possible future selves before the divorce (retrospectively) and after the divorce, rated the salience of these narratives, and completed measures of SWB and ED. Independent raters coded the narratives for amount of elaboration (i.e., vivid detail). The salience of the lost possible self w...

Optimism is associated with a range of benefits not only for general well-being, but also for mental and physical health. The development of psychological interventions to boost optimism derived from cognitive science would have the potential to provide significant public health benefits, yet cognitive markers of optimism are little understood. The current study aimed to take a first step in th...

This study examined the relations of the salience and elaboration of gay and straight possible selves to subjective well-being (SWB) and ego development (ED) in a sample of 107 gay men and lesbians, who wrote narrative descriptions of their straight and gay best possible selves and rated the salience of these narratives (i.e., the clarity of the mental image, how easy it was to imagine). Indepe...

I was surprised to see your trashing of a recent paper in Psych Science, and even more surprised to discover that you didn’t contact the authors of the paper before you publically leveled charges of sloppiness and stupidity (if not dishonesty) against them. It is really quite shameful. I was glad to see that they posted a thoughtful and temperate response on their website, though sad that it wo...