Two approaches to the formalisation of defeasible deontic reasoning

This paper compares two ways of formalising defeasible deontic reasoning, both based on the view that the issues of conflicting obligations and moral dilemmas should be dealt with from the perspective of nonmonotonic reasoning. The first way is developing a special nonmonotonic logic for deontic statements. This method turns out to have some limitations, for which reason another approach is recommended, viz. combining an already existing nonmonotonic logic with a deontic logic. As an example of this method the language of Reiter's default logic is extended to include modal expressions, after which the argumentation framework in default logic of [20, 22] is used to give a plausible logical analysis of moral dilemmas and prima facie obligations.An earlier version of this article was written while the author was working at the Department of Computing, Imperial College London, supported by ESRC/MRC/SERC Joint Council Initiative Project G9212036. Work on the present version was supported by a research fellowship of the Royal Netherlands Academy of Arts and Sciences, and by Esprit WG 8319 Modelage. I thank one of the referees for his interesting comments. Also, many thanks are due to Marek Sergot for valuable discussions on the topic of this paper.     

Helping Groups Determine Their Most Accurate Member: The Role of Outcome Feedback1

One of the difficulties groups have when making quantitative judgments is determining the relative quality of members’ inputs. Outcome feedback was investigated as a method for improving the ability of groups to identify their most accurate member. Results indicate that groups given outcome feedback were better at identifying their best member than were groups that practiced without feedback. This occurred even though the same individual was seldom the most accurate across items. However, groups given feedback were not as accurate as their best member any more often. This suggests that groups given feedback are learning how to discriminate valid from invalid cues, but are not using this information consistently when making their group estimates.     

The development and validation of computer self-efficacy and outcome expectancy scales in a nonvolitional context

Computer self-efficacy and outcome expectancy scales were developed using 306 responses to a questionnaire distributed by a national mail survey to end users of computer systems in a variety of functional business areas. Confirmatory factor analysis using a structural equations approach was used to develop three scales. The scales were found to demonstrate satisfactory psychometric properties. The reliability coefficients for these scales were as follows: .85 for computer self-efficacy; .88 for work-related outcome expectancy; and .89 for personal outcome expectancy. The scales provide a strong foundation from which to refine the measurement of computer self-efficacy and outcome expectancy. From these refinements, empirical models that include self-efficacy and outcome expectancy as determinants of information technology acceptance at the individual level of analysis can be improved.     

Omniscience and the problem of radical particularity: Does God know how to ride a bike?

International Journal for Philosophy of Religion -     

Temenos Lost: Reflections on Moving

This article examines some clinical dilemmas engendered by moving. At such times, certain patients (or the analysts themselves) may lose their sense of containment that the therapeutic space has provided. When such a disruption threatens the course of treatment, this changed condition may be archetypaily termed 'temenos lost'. Consideration of this condition has led the author to reconceptualize healing as composed of two distinct components: the healing relationship and the healing space. Together, these components define the healing archetype. Using two historical examples, the King's Evil in Tudor England and healing pilgrimages in Israel, he shows how each component may indeed operate independently. More often, however, they function together. Using an extended published case (Volkan 1984), the author examines various aspects of how patients and analysts cope with 'temenos lost'. He emphasizes the importance of the emotional atmosphere in the physical setting, anticipatory anxiety of losing the temenos, and the basic anxiety that the move will damage the analysis. The importance of the rite of re-entry for the patient is emphasized as a symbolic way of resolving 'temenos loss' that permits a healing move into a 'temenos regained'.     

NEGATIVE SIDE EFFECTS OF NONCONTINGENT REINFORCEMENT

Noncontingent reinforcement (NCR) has emerged as a treatment package for severe behavior problems. Although concerns about potential side effects (such as incidental reinforcement) have been raised, there have been few reported negative side effects in published studies to date. In this article, we report an NCR treatment evaluation for severe aggression that produced (a) an extinction burst and (b) incidental reinforcement. These side effects were evaluated by examining within-session response patterns and response distributions. As a solution, a brief omission contingency was added to the reinforcement schedule. The omission contingency resulted in decreased aggression rates.