Timely Completion of Class Requirements: Effects of Student and Faculty Gender

Male and female students have displayed different reactions to the gender of their faculty. This research was designed to explore whether biases exist early in the school term. Students unfavorable attitudes toward instructors were measured by the extent to which they delayed completing a course requirement: participation in a subject pool. Students scheduled a date upon which to participate in a research study. Discrepancies between their scheduled and their actual participation dates reveal that male students delayed their requirement (a) more when their instructors were female than when they were male, and (b) more than female students when the instructors were female. Supporting data suggest that the delayed completion time reflects lower evaluations of female faculty. Discussion focuses on implications in academic settings.     

Effects of multiple exposures to D-cycloserine on extinction of conditioned fear in rats

Previous research has shown that an acute, post-training injection of D-cycloserine (DCS) facilitates extinction of conditioned fear in rats; however, the effects of multiple exposures to DCS in this situation are not known. In Experiment 1, rats were conditioned (light-shock pairings) and 24 h later given six extinction (light-alone) trials followed by an injection of DCS (15 mg/kg) or saline. The next day, all rats were tested for light-elicited freezing. In Experiment 2, the effect of DCS on extinction was tested in the same manner, except that rats were pre-exposed to DCS (0, 1, or 5 injections) just prior to conditioning. In Experiment 3, rats received five pre-exposures of DCS but conditioning occurred either 2 or 28 days after the last pre-exposure. The results showed that DCS facilitated extinction of conditioned freezing to the light CS when no drug pre-exposure had occurred, but pre-exposure to DCS just prior to conditioning disrupted the facilitation of extinction effect. When 28 days were interposed between pre-exposure and conditioning, the facilitatory effects of DCS on extinction were restored. These findings suggest that DCS has significant clinical value but that behavioral desensitization may occur with multiple exposures; however, desensitization is not permanent and is reduced by the passage of time.     

Der menschliche Kontext von Psychotherapien

Zusammenfassung  In der vorliegenden Arbeit wird ein allgemeiner konzeptueller Rahmen vorgestellt, der die Analyse der Struktur und der Funktionen solcher komplexen Systeme, wie das menschliche Interaktionsverhalten und die Interaktionserfahrung—z. B. in der Psychotherapie—, ermöglicht. Auf der Grundlage der Handlungstheorie von Parsons und Shils (1951) wird durch systematische paarweise Kontrastierungen, durch Kombinationen der resultierenden Begriffe und durch die Betrachtung der Schnittstellen bzw. Grenzzonen ein Netzwerk von miteinander zusammenhängenden Konzepten gewonnen. Schritt für Schritt wird aus den Ausgangskonstrukten des sozialen, kulturellen, Persönlichkeits- und organismischen Systems ein flexibles Netzwerk von empirischen Konzepten abgeleitet. Mit Hilfe des so entstandenen konzeptuellen Rahmens werden die Wechselwirkungen zwischen scheinbar divergenten Aspekten der Psychotherapie aufgezeigt und die Vielfalt der Kriterien illustriert, die in Verbindung mit dem Generischen Modell der Psychotherapie (Orlinsky u. Howard 1987) zur Untersuchung der Auswirkung von therapeutischen Prozessen auf die Lebensführung und die Persönlichkeit von Patienten verwendet werden können.

Psychosozialer Versorgungsbedarf bei Arbeitnehmern

Zusammenfassung  Untersuchungen zu Häufigkeit, Verlauf und Ursachen psychischer Erkrankungen bei Arbeitnehmern sind rar. Die Gründe hierfür liegen sowohl auf Seiten der Arbeitsmedizin, die psychosoziale Aspekte wenig berücksichtigt, als auch bei der Psychotherapie, die zu wenig auf die Arbeitssituation eingeht. Die wenigen aussagekräftigen Untersuchungen legen bei Arbeitnehmern eine ähnlich hohe Prävalenz und Behandlungsbedürftigkeit nahe wie in der Allgemeinbevölkerung. Von den Folgen einer störungsinadäquaten Therapie psychischer Erkrankungen sind Arbeitnehmer in besonderem Maße betroffen, da die Erkrankungen nicht nur zu erheblichem persönlichem Leid führen, sondern durch Chronifizierung zu enormen Kosten in der medizinischen Versorgung beitragen. Außerdem sind sie durch krankheitsbedingte Fehlzeiten und (Früh-)Berentungen auch die Ursache weit reichender Produktionsausfälle in der Wirtschaft. Obwohl eine Reihe von Maßnahmen der betrieblichen Gesundheitsförderung zur Besserung der psychischen Befindlichkeit von Arbeitnehmern verfügbar sind, werden sie gegenwärtig noch zu selten eingesetzt und noch weniger evaluiert.

Continuous Performance Test Performance in a Normative Epidemiological Sample

A 14-min continuous performance test (CPT) requiring a high rate of responding was administered to a probability-weighted random sample of 816 9–17-year-old children drawn from a population of 17,117 children in an ongoing epidemiological and longitudinal study in Western North Carolina. Systematic main effects of improved performance with older age were found in this age range for all variables, including reaction time (RT), RT standard error, errors of omission, errors of commission, and signal detection parameters (d' and ). Significant gender main effects included more impulsive errors, less variability, and faster RT by males, with no interactions between age and gender. There were no main effects of ethnicity or interactions of ethnicity with age and/or gender. Large main effects of interstimulus interval (ISI; 1, 2, or 4-s intervals) and time block were present for most CPT performance measures. The normative data from the CPT should provide a useful framework for interpreting similar data in future studies of child and adolescent psychopathology.     

How pigeons discriminate the relative frequency of events.

This study examined how pigeons discriminate the relative frequencies of events when the events occur serially. In a discrete-trials procedure, 6 pigeons were shown one light nf times and then another nl times. Next, they received food for choosing the light that had occurred the least number of times during the sample. At issue were (a) how the discrimination was related to two variables, the difference between the frequencies of the two lights, D = nf - nl, and the total number of lights in the sample, T = nf + nl; and (b) whether a simple mathematical model of the discrimination process could account for the data. In contrast with models that assume that pigeons count the stimulus lights, engage in mental arithmetic on numerons, or remember the number of stimuli, the present model assumed only that the influence of a sample stimulus on choice increases linearly when the stimulus is presented, but decays exponentially when the stimulus is absent. The results showed that, overall, the pigeons discriminated the relative frequencies well. Their accuracy always increased with the absolute value of the difference D and, for D > 0, it decreased with T. Performance also showed clear recency, primacy, and contextual effects. The model accounted well for the major trends in the data.     

Estimating multiple classification latent class models

This paper presents a new class of models for persons-by-items data. The essential new feature of this class is the representation of the persons: every person is represented by its membership tomultiple latent classes, each of which belongs to onelatent classification. The models can be considered as a formalization of the hypothesis that the responses come about in a process that involves the application of a number ofmental operations. Two algorithms for maximum likelihood (ML) and maximum a posteriori (MAP) estimation are described. They both make use of the tractability of the complete data likelihood to maximize the observed data likelihood. Properties of the MAP estimators (i.e., uniqueness and goodness-of-recovery) and the existence of asymptotic standard errors were examined in a simulation study. Then, one of these models is applied to the responses to a set of fraction addition problems. Finally, the models are compared to some related models in the literature.Thanks are to Paul De Boeck for creating the intellectually stimulating atmosphere in which this class of models came about, Iven van Mechelen for theone-sided idea, Kikumi Tatsuoka for the use of her data, and Theodoor Bouw for running part of the simulation study.     

Discovery algorithms for hierarchical relations

Two algorithms based on a latent class model are presented for discovering hierarchical relations that exist among a set ofK dichotomous items. The two algorithms, stepwise forward selection and backward elimination, incorporate statistical criteria for selecting (or deleting) 0–1 response pattern vectors to form the subset of the total possible 2 ^k vectors that uniquely describe the hierarchy. The performances of the algorithms are compared, using computer-constructed data, with those of three competing deterministic approaches based on ordering theory and the calculation of Phi/Phi-max coefficients. The discovery algorithms are also demonstrated on real data sets investigated in the literature.     

Collective Identities of Class and Gender: Working-Class Women in the Pittston Coal Strike

This article investigates the intersections and tensions between two collective identities, those of class and gender, for working-class women involved in supporting the 1989–1990 strike against Pittston Coal Group in southwestern Virginia. In the case of this year-long (and ultimately successful) strike, women were organized by United Mine Workers of America (UMWA) staff in strike support activities, but they also sought to organize themselves as women. The tensions between their identity as members of the working class and their identity as women are revealed by examining their forms of activism, their relationship with the UMWA, the divisions between groups of activist women, and the articulation of women's involvement in the strike. The experiences of these women are briefly compared with women's activism in the 1984–1985 British Coal strike. The article concludes by arguing that collective identity is best understood as it emerges in response to specific contexts.     

Reviews

Stephen J. Pope The Evolution of Altruism and the Ordering of Love
Edited by Murray Rae, Hilary Regan, and John Stenhouse Science and Theology: Questions at the Interface
Edited by Peter A. French, T. E. Uehling Jr., and H. K. Wettstein Philosophical Naturalism
Edited by Steven J. Wagner and Richard Warner Naturalism: A Critical Appraisal
Mark William Worthing God, Creation, and Contemporary Physics