In‐group representation and social value affect the use of in‐group identification for maintaining and enhancing self‐evaluation

Individuals with independent self‐construals identify with their in‐group in order to buffer threats to self‐esteem to a greater degree than do those with interdependent self‐construals. This study focused on the effect of the in‐group's social value and representation on this identification process among individuals who reported various real‐world threats to their self‐esteem. We conducted a questionnaire survey for university students and we examined how self‐construal, the in‐group social value, and the in‐group representation either moderate or mediate the relationship between threat to self‐esteem and identification with their academic departments. The results of multiple‐group analyses of structural equation modelling showed that independents who reported more threats to their self‐esteem identified with the in‐group when it was high in social value. In contrast, they did not exhibit in‐group identification when it was low in social value. Interdependents showed less in‐group identification regardless of the in‐group's social value. The representation of the in‐group as a common identity group mediated the relationship between threat to self‐esteem and in‐group identification for independents, whereas the representation of a common bond group played the same role for interdependents. These findings suggest the importance of considering the role of self‐construal and the in‐group social value, along with the representation of in‐group, in understanding in‐group identification in situations of threat to self‐esteem.     

Bayesian multidimensional scaling for the estimation of a Minkowski exponent

The Minkowski property of psychological space has long been of interest to researchers. A common strategy has been calculating the stress in multidimensional scaling for many Minkowski exponent values and choosing the one that results in the lowest stress. However, this strategy has an arbitrariness problem—that is, a loss function. Although a recently proposed Bayesian approach could solve this problem, the method was intended for individual subject data. It is unknown whether this method is directly applicable to averaged or single data, which are common in psychology and behavioral science. Therefore, we first conducted a simulation study to evaluate the applicability of the method to the averaged data problem and found that it failed to recover the true Minkowski exponent. Therefore, a new method is proposed that is a simple extension of the existing Euclidean Bayesian multidimensional scaling to the Minkowski metric. Another simulation study revealed that the proposed method could successfully recover the true Minkowski exponent. BUGS codes used in this study are given in the Appendix.     

Interacción persona x situación en la predicción de la personalidad: algunas especificaciones del factor personal

RESUMEN

Este trabajo intenta determinar si la multidimensionalidad de la Ansiedad-rasgo (A-trait), medida por el S-R GTA (Inventario E-R del Rasgo General de Ansiedad) está referida a diferentes perfiles de personalidad. Los resultados del análisis de regresión lineal múltiple usando la escala de “Locus of Control” interno-externo, el Inventario Psicológico de California, la Escala de Confianza interpersonal, como medidas predictivas, confirmaron la existencia de diversos perfiles de personalidad para una de las cuatro facetas de la Ansiedad-rasgo. Estos hallazgos atestiguan la multidimensionalidad del Inventario E-R del Rasgo General Ansiedad y la importancia de especificar la situación en la medida de la Ansiedad.     

Social exclusion mediates the relationship between psychopathy and aggressive humor style in noninstitutionalized young adults

Previous research indicates a positive relationship between psychopathy and various negative humor styles. The purpose of the present study was to investigate social exclusion as a possible mediator of the association between psychopathy and negative humor styles in noninstitutionalized young adults. One hundred and thirty-nine university students participated by responding to questionnaires that assess psychopathy, the experience of exclusion from friends, and four humor styles (self-enhancing, affiliative, aggressive, and self-defeating). There was a significant positive association between psychopathy, social exclusion, and aggressive styles of humor, and a negative association between psychopathy and affiliative styles of humor. Moreover, the results of a mediation analysis indicated that the association between psychopathy and aggressive humor style is completely explained by the experience of social exclusion. These results suggest that high psychopathic participants who are socially excluded use an aggressive humor style more often than low psychopathic individuals. The present study provides further insights into the role played by social environmental factors in the links between psychopathy and associated interpersonal characteristics.     

Negative estimate of variance-accounted-for effect size: How often it is obtained,and what happens if it is treated as zero

Researchers recommend reporting of bias-corrected variance-accounted-for effect size estimates such as omega squared instead of uncorrected estimates, because the latter are known for their tendency toward overestimation, whereas the former mostly correct this bias. However, this argument may miss an important fact: A bias-corrected estimate can take a negative value, and of course, a negative variance ratio does not make sense. Therefore, it has been a common practice to report an obtained negative estimate as zero. This article presents an argument against this practice, based on a simulation study investigating how often negative estimates are obtained and what are the consequences of treating them as zero. The results indicate that negative estimates are obtained more often than researchers might have thought. In fact, they occur more than half the time under some reasonable conditions. Moreover, treating the obtained negative estimates as zero causes substantial overestimation of even bias-corrected estimators when the sample size and population effect are not large, which is often the case in psychology. Therefore, the recommendation is that researchers report obtained negative estimates as is, instead of reporting them as zero, to avoid the inflation of effect sizes in research syntheses, even though zero can be considered the most plausible value when interpreting such a result. R code to reproduce all of the described results is included as supplemental material.     

Observation system for the control of the hive environment by the honeybee (<Emphasis Type="Italic">Apis mellifera</Emphasis>)

The honeybee can control its hive environment to survive drastic changes in the field environment. To study the control of multiple environmental factors by honeybees, in this experiment, we developed a continual and simultaneous monitoring system for the temperature, moisture, and carbon dioxide (CO₂) concentration in a honeybee hive. Changes in hive weight, CO₂ production rate, and honeybee behavior were also monitored to estimate energy costs and behavioral activity for the environmental regulation. Measurements were conducted in August 2008. We found that the honeybee hive has a microclimate different from the ambient climate, and that the difference was partly accompanied by changes in honeybee activity. Our results also suggest that hive temperature, humidity, and CO₂ concentrations are controlled by different mechanisms. Additional monitoring of the hive environment and honeybee behavior for longer periods would enable us to understand the mechanisms of environmental control by honeybees, which is one of the behaviors that define honeybees as social insects.