Exemplars in the mist: the cognitive substrate of the representativeness heuristic

The idea that people often make probability judgments by a heuristic short-cut, the representativeness heuristic, has been widely influential, but also criticized for being vague. The empirical trademark of the heuristic is characteristic deviations between normative probabilities and judgments (e.g., the conjunction fallacy, base-rate neglect). In this article the authors contrast two hypotheses concerning the cognitive substrate of the representativeness heuristic, the prototype hypothesis (Kahneman & Frederick, 2002) and the exemplar hypothesis (Juslin & Persson, 2002), in a task especially designed to elicit representativeness effects. Computational modelling and an experiment reveal that representativeness effects are evident early in training and persist longer in a more complex task environment and that the data are best accounted for by a model implementing the exemplar hypothesis.     

Stress in cynomolgus monkeys (Macaca fascicularis) subjected to long-distance transport and simulated transport housing conditions

The stress associated with transportation of non-human primates used in scientific research is an important but almost unexplored part of laboratory animal husbandry. The procedures and routines concerning transport are not only important for the animals' physical health but also for their mental health as well. The transport stress in cynomolgus monkeys (Macaca fascicularis) was studied in two experiments. In Experiment 1, 25 adult female cynomolgus monkeys were divided into five groups of five animals each that received different diets during the transport phase of the experiment. All animals were transported in conventional single animal transport cages with no visual or tactile contact with conspecifics. The animals were transported by lorry for 24 h at ambient temperatures ranging between 20 degrees C and 35 degrees C. Urine produced before, during and after transport was collected and analysed for cortisol by enzyme-linked immunosorbent assay (ELISA). All monkeys exhibited a significant increase in cortisol excretion per time unit during the transport and on the first day following transport.Although anecdotal reports concerning diet during transport, including the provision of fruits and/or a tranquiliser, was thought likely to influence stress responses, these were not corrobated by the present study. In Experiment 2, behavioural data were collected from 18 cynomolgus macaques before and after transfer from group cages to either single or pair housing, and also before and after a simulated transport, in which the animals were housed in transport cages. The single housed monkeys were confined to single transport cages and the pair housed monkeys were kept in their pairs in double size cages. Both pair housed and singly housed monkeys showed clear behavioural signs of stress soon after their transfer out of their group cages.However, stress-associated behaviours were more prevalent in singly housed animals than in pair housed animals, and these behaviours persisted for a longer time after the simulated transport housing event than in the pair housed monkeys. Our data confirm that the transport of cynomolgus monkeys is stressful and suggest that it would be beneficial for the cynomolgus monkeys to be housed and transported in compatible pairs from the time they leave their group cages at the source country breeding facility until they arrive at their final laboratory destination in the country of use.     

Learning in cod (Gadus morhua): long trace interval retention

Basic knowledge about learning capacities and awareness in fish is lacking. In this study we investigated which temporal gaps Atlantic cod could tolerate between two associated events, using an appetitive trace-conditioning paradigm with blinking light as conditioned stimulus (CS) and dry fish food as unconditioned stimulus (US). CS–US presentations were either temporally overlapping (delay conditioning, CS duration 24 s, interstimulus interval 12 s) or separated by 20, 60, or 120 s (trace conditioning, CS duration 12 s) or 2 h (control, CS duration 12 s). The percentage of fish in the feeding area increased strongly during CS presentation in all delay, 20 s, and 60 s trace groups and in one out of two 120 s trace groups, but not in the control groups. In the 20 and 60 s trace procedures, the fish crowded together in the small feeding area during the trace interval, showing strong anticipatory behaviour. In all the conditioned groups, the fish responded to the CS within eight trials, demonstrating rapid learning. At 88 and 70 days after the end of the conditioning experiments, the delay and 20 s trace groups, respectively, were presented the CS six times at 2-h intervals without reward. All groups responded to the light signal, demonstrating memory retention after at least 3 months. This study demonstrates that Atlantic cod has an impressively good ability to associate two time-separated events and long time retention of learnt associations.     

Social status and shaming experiences related to adolescent overt aggression at school

Feelings of rejection and humiliation in interpersonal interaction are strongly related to aggressive behavior. The aim of this study was to investigate the association between social status, shaming experiences, gender and adolescent aggressive behavior by using a status-shaming model. A population-based sample of 5,396 adolescents aged from 15 to 18 completed a questionnaire that asked questions regarding psychosocial background, shaming experiences, social status of family, peer group and school and involvement in physical or verbal aggression at school. Shaming experiences, i.e. being ridiculed or humiliated by others, were strongly related to aggressive behavior. Social status and shaming were related in the prediction of aggressive behavior, suggesting that a person's social status may influence the risk for taking aggressive action when subjected to shaming experiences. Medium social status seemed to have a protective function in the association between shaming experiences and aggression. This study confirms the importance of further evaluation of the role of perceived social status and shaming experiences in the understanding of aggressive behavior. Moreover, the results indicate the need for different kinds of status measures when investigating the associations between status and behavior in adolescent populations. The results may have important implications for the prevention of bullying at school as well as other deviant aggressive behavior among adolescents.     

Unraveling the Aging Skein: Disentangling Sensory and Cognitive Predictors of Age‐related Differences in Decision Making

Age‐related differences in sensory functioning, processing speed, and working memory have been identified as three significant predictors of the age‐related performance decline observed in complex cognitive tasks. Yet, the assessment of their relative predictive capacity and interrelations is still an open issue in decision making and cognitive aging research. Indeed, no previous investigation has examined the relationships of all these three predictors with decision making. In an individual‐differences study, we therefore disentangled the relative contribution of sensory functioning, processing speed, and working memory to the prediction of the age‐related decline in cognitively demanding judgment and decision‐making tasks. Structural equation modeling showed that the age‐related decline in working memory plays an important predictive role, even when controlling for sensory functioning, processing speed, and education. Implications for research on decision making and cognitive aging are discussed. Copyright © 2015 John Wiley & Sons, Ltd.     

Interpersonally traumatised patients’ view of significant and corrective experiences in the psychotherapeutic relationship

Background: Clinical experience points to the importance of significant experiences in the therapy relationship for patients who have been interpersonally traumatised but the empirical research is limited.

Aim: The aim was to gain increased knowledge about how significant and potentially corrective experiences within the therapeutic relationship were described by patients in trauma-focused therapy and how the participants thought such experiences might have affected the therapeutic work.

Method: Five patients who were, or recently had been, in trauma-focused therapy were interviewed about their experiences of the therapy relationship. Thematic analysis was used to analyse the interviews.

Results: Four themes were identified: ‘Human contact’, ‘Validation’, ‘To face the painful’ and ‘Development of trust’. Positive experiences in the therapeutic relationship were sometimes seen as crucial for the therapeutic work and for patients’ improvement.

Conclusions: Previous findings about the significance of corrective experiences in psychotherapy were confirmed, particularly experiences of the therapist’s accepting stance, personal and human contact and encouragement. The therapist’s ability to evoke trust in the patient and her capacity to help patients to face painful material may be particularly important for traumatised patients.     

Natural teeth and cognitive function in humans

A number of neurobiological, psychological and social factors may account for cognitive impairment. In animal studies a relation between dental status and cognitive performance has been found. It is unclear whether such a relation exists for humans. In a first step we compared the performance of 1,351 participants (53% women, 47% men; age M = 54.0) with natural teeth to 487 edentulous participants (59% women, 41% men; age M = 71.3) on 12 cognitive tests. The natural teeth group had a lower mean age, fewer women, more years of education, higher mini-mental state (MMSE), and performed significantly higher on several cognitive tests. In a subsequent analysis, the cognitive performance of a subset of the participants (50-85 years) was examined. In this analysis, 211 had natural dentition and 188 were edentulous. The groups were matched for gender, age, social variables, diseases, stress and MMSE. The cognitive disadvantage of the edentulous group was still apparent. The results suggest that functional natural teeth relate to relatively preserved cognitive functioning in older age.     

International career articles: A content analysis of four journals across 34 years

This study included a review and content analysis of international career articles published in four major U.S. vocational/career journals over a 34-year time period. Three hundred and twenty-six articles were identified, constituting 2.4% of the total number of articles published in these journals during this time. The results showed an increasing number of international career articles being published over time and that most of them are empirically based, with adult professionals as the most common sample type. The two most common content areas identified were Career Issues Related to a Specific Culture, Country, or Population and Academic and Vocational Attitudes. Further, a substantial amount of these publications originated from institutions in Israel. Implications for practice and future research are discussed.     

A Content and Sample Analysis of Quantitative Articles Published in the Journal of Counseling & Development Between 1991 and 2000

This study reviewed the content of articles and characteristics of samples in all quantitative articles published in the Journal of Counseling & Development between 1991 and 2000. The content analysis revealed that the areas that received the most attention were academic/career, multicultural issues, symptoms/disorders, and counseling process. Gender was reported in 88%, race/ethnicity in 60%, socioeconomic status in 11%, and sexual orientation in 1% of the articles. Implications for future research are addressed.     

Beyond ‘Liberals’ and ‘Conservatives’: Complexity in Ideology,Moral Intuitions,and Worldview Among Swedish Voters

This research investigated the congruence between the ideologies of political parties and the ideological preferences (N = 1515), moral intuitions (N = 1048), and political values and worldviews (N = 1345) of diverse samples of Swedish adults who voted or intended to vote for the parties. Logistic regression analyses yielded support for a series of hypotheses about variations in ideology beyond the left–right division. With respect to social ideology, resistance to change and binding moral intuitions predicted stronger preference for a social democratic (vs. progressive) party on the left and weaker preference for a social liberal (vs. social conservative or liberal-conservative) party on the right. With respect to political values and broader worldviews, normativism and low acceptance of immigrants predicted the strongest preference for a nationalist party, while environmentalism predicted the strongest preference for a green party. The effects were generally strong and robust when we controlled for left–right self-placements, economic ideology, and demographic characteristics. These results show that personality variation in the ideological domain is not reducible to the simplistic contrast between ‘liberals’ and ‘conservatives’, which ignores differences between progressive and non-progressive leftists, economic and green progressives, social liberal and conservative rightists, and nationalist and non-nationalist conservatives.