The dissemination of critical,unshared information in decision‐making groups: the effects of pre‐discussion dissent

Previous research in group decision making has found that in situations of a hidden profile (i.e. the best choice alternative is hidden from individual members as they consider their pre‐discussion information), unshared information is disproportionately neglected and sub‐optimal group choices are highly likely. In an experimental study, three‐person groups decided which of three candidates to select for a professorial appointment. We hypothesised that minority dissent in pre‐discussion preferences improves the consideration of unshared information in groups and increases the discovery rate of hidden profiles. As predicted, consideration of unshared information increased with minority dissent. The expectation of an improvement of group decision quality was partially supported. In diversity groups (i.e. each member prefers a different alternative) consideration of unshared information and group decision quality was significantly higher than in simple minority groups. Results are discussed in the light of theories of minority influence. The benefits of using the hidden profile paradigm with minority and diversity groups for theory development in the area of group decision making are highlighted. Copyright © 2002 John Wiley & Sons, Ltd.     

Total number of MMPI-2 clinical scale elevations predicts premature termination after controlling for intake symptom severity and personality disorder diagnosis

Premature termination of therapy by patients is a common phenomenon that can be deleterious to treatment outcome for patients and also negatively affect therapists, treatment centers, and research programs. Therefore, a method of identifying patients at risk for premature termination could have widespread benefits. This study investigated whether patients’ MMPI-2 profiles, including clinical scale elevations and Negative Treatment Indicator (TRT) scores, could predict premature termination in an outpatient sample, controlling for personality disorder diagnosis and symptom severity at intake. Results indicated that while TRT scores were not incrementally predictive of premature termination, the total number of clinical scale elevations was significantly incrementally predictive of dropout. Clinical implications are discussed.     

Depressed mothers’ infants show less negative affect during non-contingent interactions

Infants of depressed and non-depressed mothers were videotaped interacting with their mothers in the [Nadel, J., Carchon, I., Kervella, C., Marcelli, D., & Reserbat-Plantey, D. (1999). Report: Expectancies for social contingency in 2-month-olds. Developmental Science, 2, 164–173] paradigm which consists of three segments including: (1) a free play, contingent interaction, (2) a non-contingent replay of the mothers’ behavior that had been videotaped during the first segment, and (3) a return to a free play, contingent interaction. As compared to infants of non-depressed mothers, infants of depressed mothers showed less negative change (less increase in frowning) in their behavior during the non-contingent replay segment. This finding was interpreted as the infants of depressed mothers being more accustomed to non-contingent behavior in their mothers, thus experiencing less violation of expectancy in this situation.     

What is the shape of developmental change?

Developmental trajectories provide the empirical foundation for theories about change processes during development. However, the ability to distinguish among alternative trajectories depends on how frequently observations are sampled. This study used real behavioral data, with real patterns of variability, to examine the effects of sampling at different intervals on characterization of the underlying trajectory. Data were derived from a set of 32 infant motor skills indexed daily during the first 18 months. Larger sampling intervals (2-31 days) were simulated by systematically removing observations from the daily data and interpolating over the gaps. Infrequent sampling caused decreasing sensitivity to fluctuations in the daily data: Variable trajectories erroneously appeared as step functions, and estimates of onset ages were increasingly off target. Sensitivity to variation decreased as an inverse power function of sampling interval, resulting in severe degradation of the trajectory with intervals longer than 7 days. These findings suggest that sampling rates typically used by developmental researchers may be inadequate to accurately depict patterns of variability and the shape of developmental change. Inadequate sampling regimes therefore may seriously compromise theories of development.     

The Role of Parenthood and College Education in the Self-Concept of College Students: Explicit and Implicit Assessments of Gendered Aspirations

This research examined the extent to which parenthood and college education are incorporated into the self-concept of college students. A US sample of undergraduates (90 men, 87 women) attending a large and ethnically diverse university completed explicit and implicit measures of identification with “parenthood” and “college education,” associations between these concepts and gender categories, and gender identification. Explicitly, men and women identified strongly with college education. Implicitly, women identified equally with parenthood and college education, whereas men identified more strongly with college education. In addition, implicit measures revealed that traditional gender roles accounted for a stronger identification with parenthood for participants who displayed a female identity and a stronger identification with college education for participants who displayed a male identity.     

Generalization and similarity in exemplar models of categorization: Insights from machine learning

Exemplar theories of categorization depend on similarity for explaining subjects’ ability to generalize to new stimuli. A major criticism of exemplar theories concerns their lack of abstraction mechanisms and thus, seemingly, of generalization ability. Here, we use insights from machine learning to demonstrate that exemplar models can actually generalize very well. Kernel methods in machine learning are akin to exemplar models and are very successful in real-world applications. Their generalization performance depends crucially on the chosen similarity measure. Although similarity plays an important role in describing generalization behavior, it is not the only factor that controls generalization performance. In machine learning, kernel methods are often combined with regularization techniques in order to ensure good generalization. These same techniques are easily incorporated in exemplar models. We show that the generalized context model (Nosofsky, 1986) and ALCOVE (Kruschke, 1992) are closely related to a statistical model called kernel logistic regression. We argue that generalization is central to the enterprise of understanding categorization behavior, and we suggest some ways in which insights from machine learning can offer guidance.     

The roots of human altruism

Human infants as young as 14 to 18 months of age help others attain their goals, for example, by helping them to fetch out‐of‐reach objects or opening cabinets for them. They do this irrespective of any reward from adults (indeed external rewards undermine the tendency), and very likely with no concern for such things as reciprocation and reputation, which serve to maintain altruism in older children and adults. Humans' nearest primate relatives, chimpanzees, also help others instrumentally without concrete rewards. These results suggest that human infants are naturally altruistic, and as ontogeny proceeds and they must deal more independently with a wider range of social contexts, socialization and feedback from social interactions with others become important mediators of these initial altruistic tendencies.     

Cross Cutting Issues in the Practice of Psychotherapy in Nigeria

The need to bridge the gap between western based psychotherapeutic intervention and African psychotherapeutic interventions is the main objective of this paper. In order to do this, cross cutting issues in psychotherapy in Nigeria were reviewed. This review covered socio cultural, economic conditions and other contemporary issues such as child maltreatment, HIV/AIDS, chronic illness, terrorism and the impact of western civilization on Nigerian culture and how it has produced a heterogeneous Nigerian society described as westernized, traditional and transitional types of Nigerians. Also salient peculiarities that must be taken into consideration in bridging the gap between western and African based psychotherapy were identified. Some of these salient peculiarities were adumbrated and they include frequent somatic complaints of psychological origin, beliefs in spirits including ancestral spirits, independent spirits and the supreme spirit God to whom duties are owed to keep the moral order. Given this situation the authors expressed uncertainty in the use of western diagnostic illness categories. Also an attempt was made to describe traditional methods of treatment such as the popular prayer houses and traditional healers. From lessons learnt based on these cross cutting issues the authors reported the development of Harmony Restoration Therapy and Meseron treatment frameworks as attempts at indigenizing western psychotherapeutic methods. From these they proposed the way forward as a cultural blend through using culture based psychotherapeutic framework. This they suggest can be applied in other societies.