The effects of acute plasma tryptophan manipulation on hostile mood: The influence of trait hostility

The effects of acute plasma tryptophan manipulation on changes in hostile, anxious, and depressive mood were studied in 48 males. Subjects consumed tryptophan-free or nutritionally balanced amino acid mixtures as a means of manipulating brain serotonin levels. Mood (hostility, anxiety, depression) was assessed pre- and 5 hr post-ingestion using the Multiple Affect Adjective Checklist. Overall, the tryptophan manipulation resulted in significant changes in hostile mood. Analyses also revealed a stronger association between changes in plasma tryptophan and changes in hostility in subjects with high levels of pre-existing hostile traits compared with low levels of hostile traits, and in subjects with high vs. Low antisocial traits. There was no significant association between changes in plasma tryptophan and changes in depression. The results suggest that persons with high levels of trait hostility may be more susceptible to the effects of acute manipulation of plasma tryptophan on hostile mood. Aggr. Behav. 24:173–185, 1998. © 1998 Wiley-Liss, Inc.     

is affirmative action still necessary?

The influences of socio‐race, racial identity development, gender, educational level, and age on promotion and compensation decisions by midlevel supervisors in industry were examined in this analogue study of 74 midlevel business and industry supervisors. The participants varied in socio‐racial classifications, gender, educational levels, and age. Results of this study indicated statistically significant differences in promotion rates of female analogue employees, rates of promotion between White male and Black male supervisors, and the rate of promotion when comparing older versus younger supervisors.     

The Relationship‐specific Interpretation Bias Mediates the Link between Neuroticism and Satisfaction in Couples

Neuroticism has repeatedly been shown to be a predictor of relationship dissatisfaction in couples. The aim of the current research was to uncover the underlying cognitive processes of this robust effect. We focused on anxiety as one aspect of neuroticism that is associated with different kinds of cognitive biases. On the basis of the assumption that biased information processing will also affect specific interpersonal contexts such as romantic relationships, it was expected that the tendency to interpret ambiguous partner and relationship scenarios in a rather negative way would work as a potential mediator. In Study 1, parallel forms of a new measure to capture the relationship‐specific interpretation bias (RIB) were developed (N = 182). In Study 2, the proposed meditational role of the RIB was investigated in a dyadic sample of 210 couples. Dyadic analysis using the Actor–Partner Interdependence Mediation Model showed mediation of the interpretation bias even when the general interpretation bias and attachment styles were controlled. Results support the assumption that biased relationship‐specific interpretations are one important mechanism for how neuroticism exerts its negative influence on relationship satisfaction. We conclude that personality‐congruent cognitive processing may not only have individual consequences but also affect overall couple functioning. Copyright © 2013 John Wiley & Sons, Ltd.     

Repetition-lag training to improve recollection memory in older people with amnestic mild cognitive impairment. A randomized controlled trial

The results of a randomized controlled trial of repetition-lag training in older adults with amnestic mild cognitive impairment (aMCI) are reported. A modified repetition-lag training procedure with extended encoding time and strategy choice was used. The training required discriminating studied words from non-studied lures that were repeated at varying intervals during the test phase. Participants were assessed pre/post using untrained measures of cognition and self-report questionnaires. Primary outcome measures were recall of unrelated word pairs both immediately following presentation and following a delay. Secondary outcomes were a measure of attention, cognitive flexibility, and visual working memory. Participants were also asked to report on the frequency of cognitive failures and mood before and after training. Participants (N = 31) were randomized into either the treatment or a no-contact control group and attended the clinic twice per week over a four week period. Twenty-four participants completed the study (twelve in each group). Results indicated that the training group improved at recalling unrelated word pairs after a delay. There were no significant effects of training on other outcomes, self-reported cognitive failures or mood. The results are discussed along with suggestions for future research.     

People's hypercorrection of high-confidence errors: did they know it all along?

This study investigated the "knew it all along" explanation of the hypercorrection effect. The hypercorrection effect refers to the finding that when people are given corrective feedback, errors that are committed with high confidence are easier to correct than low-confidence errors. Experiment 1 showed that people were more likely to claim that they knew it all along when they were given the answers to high-confidence errors as compared with low-confidence errors. Experiments 2 and 3 investigated whether people really did know the correct answers before being told or whether the claim in Experiment 1 was mere hindsight bias. Experiment 2 showed that (a) participants were more likely to choose the correct answer in a 2nd guess multiple-choice test when they had expressed an error with high rather than low confidence and (b) that they were more likely to generate the correct answers to high-confidence as compared with low-confidence errors after being told they were wrong and to try again. Experiment 3 showed that (c) people were more likely to produce the correct answer when given a 2-letter cue to high- rather than low-confidence errors and that (d) when feedback was scaffolded by presenting the target letters 1 by 1, people needed fewer such letter prompts to reach the correct answers when they had committed high- rather than low-confidence errors. These results converge on the conclusion that when people said that they knew it all along, they were right. This knowledge, no doubt, contributes to why they are able to correct those high-confidence errors so easily.     

Metacognitive judgments of repetition and variability effects in natural concept learning: evidence for variability neglect

In four experiments, we examined the effects of repetitions and variability on the learning of bird families and metacognitive awareness of such effects. Of particular interest was the accuracy of, and bases for, predictions regarding classification of novel bird species, referred to as category learning judgments (CLJs). Participants studied birds in high repetitions and high variability conditions. These conditions differed in the number of presentations of each bird (repetitions) and the number of unique species from each family (variability). After study, participants made CLJs for each family and were then tested. Results from a classification test revealed repetition benefits for studied species and variability benefits for novel species. In contrast with performance, CLJs did not reflect the benefits of variability. Results showed that CLJs were susceptible to accessibility-based metacognitive illusions produced by additional repetitions of studied items.     

Reconsolidation from negative emotional pictures: Is successful retrieval required?

Finn and Roediger (Psychological Science 22:781-786, 2011) found that when a negative emotional picture was presented immediately after a successful retrieval, later test performance was enhanced as compared to when a neutral picture or a blank screen had been shown. This finding implicates the period immediately following retrieval as playing an important role in determining later retention via reconsolidation. In two new experiments, we investigated whether successful retrieval was required to show the enhancing effect of negative emotion on later recall. In both experiments, the participants studied Swahili-English vocabulary pairs, took an intervening cued-recall test, and were given a final cued-recall test on all items. In Experiment 1, we tested a distinctiveness explanation of the effect. The results showed that neither presentation of a negative picture just prior to successful retrieval nor presentation of a positive picture after successful retrieval produced the enhancing effect that was seen when negative pictures were presented after successful retrieval. In Experiment 2, we tested whether the enhancing effect would occur when a negative picture followed an unsuccessful retrieval attempt with feedback, and a larger enhancement effect occurred after errors of commission than after errors of omission. These results indicate that effort in retrieving is critical to the enhancing effect shown with negative pictures; whether the target is produced by the participant or given by an external source following a commission error does not matter. We interpret these results as support for semantic enrichment as a key element in producing the enhancing effect of negative pictures that are presented after a retrieval attempt.     

A year in the college life: Evidence for the social investment hypothesis via trait self-control and alcohol consumption

The present study examined 12-month prospective relations among trait self-control, subjective role investment, and alcohol consumption in a sample of university students (N = 129). Using neo-socioanalytic theory and the social investment hypothesis as guiding frameworks, it was expected that greater initial role investment would predict greater self-control and less alcohol consumption at follow-up. Path analyses showed higher initial levels of subjective college student role investment predicted greater subsequent self-control and lower drinking amounts, controlling for initial standing on self-control and alcohol consumption. Greater initial trait self-control also predicted subsequent lower alcohol consumption. The discussion emphasizes the importance of incorporating subjective role investment, in addition to nominal role participation, in developmental accounts of personality traits, social identity, and behavior.