Psychiatric chrono‐epidemiology: its relevance for the study of aggression

Chrono‐epidemiology is the study of the distribution of health events according to time. The time intervals taken into account have cyclic patterns and include circadian, weekly, seasonal, and circannual rhythms. In the behavioural field, chrono‐epidemiology can be and has been applied to studies concerning the causes of death (suicide and homicide), clinical events such as admissions to and contacts with mental healthcare services, and the seasonal distribution of crime involving the use of violence. Frequently reported findings include clear circadian and seasonal rhythms present in the phenomenon of suicide (rhythms more evident in the case of violent suicide); seasonal rhythms in the expression of aggression by patients hospitalised for mental illness; and a circannual recurrence of crimes with a violent component. The intrinsic circadian and seasonal rhythms of some neuronal systems, particularly those of serotonin, involved in the control of mood and impulses, are thought to favour the behavioural rhythms observed, although the contribution of socio‐environmental factors, such as the fluctuation of supportive networks according to time, is also acknowledged. By demonstrating non‐casual recurrence of certain behaviour and by exploring the socio‐biological basis of the rhythms beneath these recurrences, chrono‐epidemiology may offer important etiologic and preventive clues to the understanding of the biological and environmental correlates of aggressive behaviour. Aggr. Behav. 28:477–490, 2002. © 2002 Wiley‐Liss, Inc.     

WOMEN, LEADERSHIP, AND EMPOWERMENT

This paper is a review of leadership research, focusing primarily on women as leaders. The more recent perspective of studying leaders by examining followers is included; but research is sparse as to how leaders are perceived as empowering by their subordinates. A study in progress, conducted by Denmark, Nielson, and Scholl, indicates that stereotypes were more typically held by women against female leaders. However, a leader's ability to be empowering varies with status. The higher the status, the more empowering that individual is perceived, whether female or male. Yet, more men than women held higher status positions. More women are needed in high-level positions to better assess leadership and empowerment.     

Stereotype activation is unintentional: Behavioural and event‐related potenials evidence

In this study, a priming Stroop paradigm was used to determine whether stereotype activation is unintentional. Priming conditions (priming/no‐priming) and the relationship between priming and target (consistent/inconsistent/no‐relation) were the independent variables; accuracy, reaction time and N400 amplitude were used as dependent variables. The reaction time revealed that stereotype activation is, to some extent, unintentional. Furthermore, the event‐related potenial (ERP) results showed that N400 amplitude was larger for inconsistent conditions than for consistent conditions. This result supported the notion that stereotype activation is an unintentional and automatic process.     

Causal conditional reasoning and semantic memory retrieval: a test of the semantic memory framework

This study tested and refined a framework that proposes a mechanism for retrieving alternative causes and disabling conditions (Cummins, 1995) during reasoning. Experiment 1 examined the relation between different factors affecting retrieval. The test revealed high correlations between the number of possible alternative causes or disabling conditions and their strength of association and plausibility. Experiment 2 explored the hypothesis that due to a more extended search process, conditional inferences would last longer when many alternative causes or disabling conditions were available. Affirmation of the consequent (AC) and modus ponens (MP) latencies showed the hypothesized pattern. Denial of the antecedent (DA) and modus tollens (MT) inferences did not show latency effects. The experiment also identified an effect of the number of disabling conditions on AC and DA acceptance. Experiment 3 measured efficiency of disabler retrieval by a limited time, disabler generation task. As predicted, better disabler retrieval was related to lower acceptance of the MP and MT inferences.     

The Mobilizing Effect of Right‐Wing Ideological Climates: Cross‐Level Interaction Effects on Different Types of Outgroup Attitudes

The present research investigated a multilevel person‐context interactionist framework for the relationship between right‐wing ideologies and prejudice across two large, representative samples (Study 1: European Social Survey: N = 56,752; Study 2: World Values Survey: N = 74,042). Across three different operationalizations of right‐wing ideology, two contextual levels (regional and national) of right‐wing climate, and three types of outgroup attitudes (i.e., age‐, ethnicity‐, and gender‐based), the analyses consistently revealed cross‐level interactions, showing a strong association between right‐wing attitudes and negative outgroup attitudes at the individual level in contexts with a low right‐wing climate, whereas this relationship is weaker and often even absent in contexts with a high right‐wing climate. These cross‐level interactions remained significant after controlling for statistical artefacts (i.e., restriction of range and outliers). The authors propose norm setting as the mobilizing mechanism through which a right‐wing climate develops and curbs the influence of individual right‐wing social‐ideological attitudes on outgroup attitudes.     

Age differences in verbal and visuo-spatial working memory updating: evidence from analysis of serial position curves

Memory updating is the ability to select and update relevant information and suppress no-longer-relevant data. The few studies in this area, targeting mainly the verbal domain, have investigated and confirmed an age-related decline in working memory updating ability (De Beni & Palladino, 2004; Van der Linden, Bredart, & Beerten, 1994). The present research examines the ability of younger and older adults to update information in verbal and visuo-spatial running memory tasks. Results showed that the participants' performance was higher in the verbal than in the visuo-spatial task. Nonetheless, independently of the task domain, an age-related decline in updating performance was found. Moreover, analysis of serial positions suggested that, in the updating procedure, the participants were not attempting to actively maintain items, preferring to adopt a low-effort, "recency-based" strategy. The use of this type of strategy is more evident in older participants, as shown in both the accuracy performance and the proportion of intrusion errors.     

Temperament and Problematic Alcohol Use in Adolescence: an Examination of Drinking Motives as Mediators

The present study investigated the associations between temperamental reactivity, drinking motives, alcohol consumption and alcohol-related consequences. Furthermore, it investigated whether drinking motives mediate the relations between temperamental reactivity and the alcohol use variables. The sample consisted of 188 adolescents (64.9% boys) between the ages of 13–20 years (M _age  = 16.9, SD = 1.32). Results revealed that the temperament factors of high BAS fun seeking and high negative affectivity were related to alcohol consumption and alcohol-related consequences respectively. Furthermore, high social and enhancement motives and low conformity motives were associated with alcohol consumption, whereas high coping-depression motives were associated with alcohol-related consequences. Finally, the relation between BAS fun seeking and alcohol consumption was mediated by enhancement and social motives and the association between negative affectivity and alcohol-related consequences was mediated by coping-depression motives. These results highlight the importance of focusing on temperament profiles and their associated drinking motives in the prevention and intervention of alcohol use problems among adolescents.