Hempel’s logic of confirmation

This paper presents a new analysis of C.G. Hempel’s conditions of adequacy for any relation of confirmation [Hempel C. G. (1945). Aspects of scientific explanation and other essays in the philosophy of science. New York: The Free Press, pp. 3–51.], differing from the one Carnap gave in §87 of his [1962. Logical foundations of probability (2nd ed.). Chicago: University of Chicago Press.]. Hempel, it is argued, felt the need for two concepts of confirmation: one aiming at true hypotheses and another aiming at informative hypotheses. However, he also realized that these two concepts are conflicting, and he gave up the concept of confirmation aiming at informative hypotheses. I then show that one can have Hempel’s cake and eat it too. There is a logic that takes into account both of these two conflicting aspects. According to this logic, a sentence H is an acceptable hypothesis for evidence E if and only if H is both sufficiently plausible given E and sufficiently informative about E. Finally, the logic sheds new light on Carnap’s analysis.     

Size and Structure of the Holistic Milieu: A Comparison of Local Mapping Studies in Austria and Sweden

This article presents the results of two local mapping studies in Sweden and Austria that follow the methodological procedure of the British Kendal project. All practitioners offering courses, therapies or counseling in the areas of holistic spirituality and complementary health methods (such as yoga, Reiki, kinesiology, astrology, and shamanism) were mapped. A sub-sample of the mapped practitioners were contacted in person and asked about their professional situation and the number of their clients. On the basis of these data, the proportion of persons participating in the holistic milieu was estimated. The article discusses the similarities and differences between the two regions in regard to the supply of specific types of holistic activities, the professional situation of the practitioners, and the proportion of the population involved in holistic activities. The level of engagement in holistic activities in the Swedish, Austrian, and British mapping areas is also compared with the level of church attendance in the three countries.     

Prior cocaine exposure disrupts extinction of fear conditioning

Psychostimulant exposure has been shown to cause molecular and cellular changes in prefrontal cortex. It has been hypothesized that these drug-induced changes might affect the operation of prefrontal-limbic circuits, disrupting their normal role in controlling behavior and thereby leading to compulsive drug-seeking. To test this hypothesis, we tested cocaine-treated rats in a fear conditioning, inflation, and extinction task, known to depend on medial prefrontal cortex and amygdala. Cocaine-treated rats conditioned and inflated similar to saline controls but displayed slower extinction learning. These results support the hypothesis that control processes in the medial prefrontal cortex are impaired by cocaine exposure.     

Statistical power analyses using G<Superscript>*</Superscript>Power 3.1: Tests for correlation and regression analyses

G^*Power is a free power analysis program for a variety of statistical tests. We present extensions and improvements of the version introduced by Faul, Erdfelder, Lang, and Buchner (2007) in the domain of correlation and regression analyses. In the new version, we have added procedures to analyze the power of tests based on (1) single-sample tetrachoric correlations, (2) comparisons of dependent correlations, (3) bivariate linear regression, (4) multiple linear regression based on the random predictor model, (5) logistic regression, and (6) Poisson regression. We describe these new features and provide a brief introduction to their scope and handling.     

Personal construct theory and the argument against mental illness

An attempt is made to integrate Thomas Szasz's 0974) theory of personal conduct and George Kelly's (1955) theory of personal constructs (PCT). It is argued that PCT provides an alternative to the void left behind by Szasz's negation of mental illness. Because PCT is concerned with psychological, rather than physiological, constructions of problems in living, it is not compatible with the biological model associated with Diagnostic and Statistical Manual of Mental Disorders (DSM) diagnostic categories. Rather, it is in keeping with the views of Szasz. Kelly's and Szasz's writings are used to support this view. Kelly's transitive diagnosis approach to “mental illness”, wherein diagnosis and therapy are construed as process oriented as opposed to category driven, is described as an alternative to the biological model. A contextualist approach (Sarbin & Mancuso, 1980) is also discussed. These approaches not only empower clients and allow them to assert responsibility and control over their lives, but also provide an alternative system to the one rejected by Szasz.     

Spatial Coupling in the Coordination of Complex Actions

The majority of investigations on coordinated action have focused on temporal constraints in movements. Recent studies have demonstrated spatial constraints when the hands produce different trajectory shapes simultaneously. The focus of the current study was to determine whether spatial coupling occurs in individual parameters of the actions, or whether the shapes per se undergo accommodation. Subjects were tested on a bimanual paradigm to investigate the nature of spatial constraints in complex tasks. Shape and size of the required trajectories were varied for the two limbs. When trajectories that require different shapes were assigned to the two hands,disruption in the spatial characteristics of the trajectories was observed. Disruption in the global patterns of the trajectories could be described on the basis of coupling in individual parameters of action, direction, and amplitude, which could be inferred by decomposing the trajectories into orthogonal components. Amplitude accommodation in these orthogonal components of motion increased linearly with the difference in required amplitude for the two limbs. Interpretations of these effects suggest that directional coupling is a result of interference between two different response plans, whereas amplitude coupling may be related to either planning or execution variables. These results strongly suggest the need for further investigation of the spatial domain of complex coordinated action.