Dopamine modulates frontomedial failure processing of agentic introverts versus extraverts in incentive contexts

The agency facet of extraversion (aE) describes individual differences in goal-directed behavior and has been linked to dopamine function in incentive contexts. Because dopamine presumably modulates the processing of negative feedback/failure, aE may relate to failure processing in incentive contexts. To test this hypothesis, N = 86 participants performed a virtual ball-catching task. An incentive context was created by displaying potential rewards and subtle manipulations of task performance, which either was (control group) or was not (incentive context group) made explicit. To probe the involvement of dopamine, participants received either placebo or the selective dopamine D2 receptor antagonist sulpiride (200 mg). Failure processing was assessed through negative-feedback-evoked differences in the frontal midline theta electroencephalogram power (DFMT) and in the feedback-related negativity event-related potential component (FRN). Before incentives were introduced, DFMT (but not the FRN) was related to neuroticism/anxiety. Importantly, once incentives were displayed, aE was associated with DFMT, FRN, task performance, and changes in self-reported positive affect, which further depended on incentive context group and/or substance group: In the incentive context group but not in the control group, agentic extraverts showed relatively blunted DFMT after placebo. Sulpiride significantly enhanced DFMT, whereas it reduced FRN amplitudes and performance in agentic extra- versus introverts. These findings provide strong support for current dopamine models of aE and failure processing, and also highlight the importance of task context. Moreover, the dissociations of FRN and DFMT suggest the existence of two nonredundant electrophysiological indices of feedback processing, both relating to dopamine and aE.     

Two‐year‐old children but not domestic dogs understand communicative intentions without language,gestures, or gaze

Infants can see someone pointing to one of two buckets and infer that the toy they are seeking is hidden inside. Great apes do not succeed in this task, but, surprisingly, domestic dogs do. However, whether children and dogs understand these communicative acts in the same way is not yet known. To test this possibility, an experimenter did not point, look, or extend any part of her body towards either bucket, but instead lifted and shook one via a centrally pulled rope. She did this either intentionally or accidentally, and did or did not address her act to the subject using ostensive cues. Young 2‐year‐old children but not dogs understood the experimenter's act in intentional conditions. While ostensive pulling of the rope made no difference to children's success, it actually hindered dogs' performance. We conclude that while human children may be capable of inferring communicative intent from a wide variety actions, so long as these actions are performed intentionally, dogs are likely to be less flexible in this respect. Their understanding of communicative intention may be more dependent upon bodily markers of communicative intent, including gaze, orientation, extended limbs, and vocalizations. This may be because humans have come under selective pressure to develop skills for communicating with absent interlocutors – where bodily co‐presence is not possible.     

Acute aerobic exercise improves memory across intensity and fitness levels

ABSTRACT

The present study was designed to examine the impact of exercise intensity and aerobic fitness on free recall, judgments of learning (JOLs), and metacognitive accuracy. In Experiment 1, 30 college students engaged in either (1) no exercise, (2) light exercise (55% of predicted maximal heart rate), or (3) moderate exercise (75% of predicted maximal heart rate) on three different days. In Experiment 2, 29 high-fit students (VO₂ max?≥?70th percentile) and 28 low-fit students (VO₂ max?≤?50th percentile) completed sedentary and light exercise conditions. In both experiments, free recall scores significantly increased in the exercise conditions compared with the sedentary condition, but JOL magnitude and metacognitive accuracy were largely unaffected. These results demonstrate that exercise can improve recall at both light and high intensities, and that the benefit can be obtained by individuals regardless of their fitness level.     

Mood-dependent retrieval and mood awareness

Abstract

In six experiments, subjects were induced into happy or sad moods prior to studying a list of words, and then induced into either the same or different mood prior to freely recalling the list. In addition, subjects were administered various individual difference measures of mood states. The hypothesis was that subjects who profess to be most aware of their moods would be most likely to show disrupted performance when study and test moods were different. Mood-dependent performance was not generally observed, nor was there any evidence that it more consistently emerged for high-aware subjects.     

When autocratic leaders become an option--uncertainty and self-esteem predict implicit leadership preferences

We investigated the impact of uncertainty on leadership preferences and propose that the conjunction of self-esteem level and stability is an important moderator in this regard. Self-threatening uncertainty is aversive and activates the motivation to regain control. People with high and stable self-esteem should be confident of achieving this goal by self-determined amelioration of the situation and should therefore show a stronger preference for democratic leadership under conditions of uncertainty. By contrast, people with low and unstable self-esteem should place their trust and hope in the abilities of powerful others, resulting in a preference for autocratic leadership. Studies 1a and 1b validate explicit and implicit leadership measures and demonstrate a general prodemocratic default attitude under conditions of certainty. Studies 2 and 3 reveal a democratic reaction for individuals with stable high self-esteem and a submissive reaction for individuals with unstable low self-esteem under conditions of uncertainty. In Study 4, this pattern is cancelled out when individuals evaluate leadership styles from a leader instead of a follower perspective.     

Increased activation in superior temporal gyri as a function of increment in phonetic features

A common assumption is that phonetic sounds initiate unique processing in the superior temporal gyri and sulci (STG/STS). The anatomical areas subserving these processes are also implicated in the processing of non-phonetic stimuli such as music instrument sounds. The differential processing of phonetic and non-phonetic sounds was investigated in this study by applying a “sound-morphing” paradigm, where the presence of phonetic features were parametrically varied, creating a step-wise transition from a non-phonetic sound into a phonetic sound. The stimuli were presented in an event-related fMRI design. The fMRI-BOLD data were analysed using parametric contrasts. The results showed a higher sensitivity for sounds containing phonetic features compared to non-phonetic sounds in the middle part of STG, and in the anterior part of the planum temporale (PT) bilaterally. Although the same areas were involved in the processing of non-phonetic sounds, a difference in activation was evident in the STG, with an increase in activation related to increment of phonetic features in the sounds. The results indicate a stimulus-driven, bottom-up process that utilizes general auditory resources in the secondary auditory cortex, depending on specific phonetic features in the sounds.     

Assessment Center for Pilot Selection: Construct and Criterion Validity and the Impact of Assessor Type

Cette recherche a examiné la validité d'un centre d'évaluation pour la sélection de pilotes. Les scores de N = 1,036 participants ont été utilisés pour étudier la validité de construit. Un sous-échantillon de participants performants a été suivi et les évaluations des pairs ont été retenus comme mesures du critère. Les résultats démontrent une première évidence de validité de construit et de critère pour cet outil d'évaluation des compétences interpersonnelles et liées à la performance. Par ailleurs, les résultats ont aussi montré que le type d'évaluateur (psychologue vs pilote) modère la validité prédictive des scores du centre d'évaluation. Cet effet "type d'évaluateur" dépend de la sorte de variables prédictives. Les résultats sont discutés et des implications pratiques sont suggérées.
This study examined the validity of an assessment center in pilot selection as a new field of application. Assessment center ratings of N = 1,036 applicants were used to examine the construct validity. A subsample of successful applicants was followed up and peer ratings were chosen as criterion measures. The results provide first evidence of the construct and criterion validity of this assessment center approach for rating interpersonal and performance-related skills. Furthermore the type of assessor (psychologist versus pilot) moderates the predictive validity of the assessment center ratings. This type-of-assessor effect depends on the kind of predictor variables. The results are discussed and practical implications are suggested.     

What happened to the Canada-United States brain drain of the 1990s? New evidence from the 2000 US census

This article uses the 2000 US Census to ascertain both quantitative and qualitative changes in Canadian immigrants to the United States through, the 1990s, and compares these to earlier migration cohorts from census data in 1980 and 1990. Canadians in the United States continue to have higher relative salaries and education levels vis-à-vis their American counterparts and this gap has widened in the 1990s, even when controlling for variety of labour market factors. A similar phenomenon occurred amongst immigrants from Britain and Ireland and suggests that US economic performance and immigration policy are the probable driving, force behind this migration.     

Attributional Complexity: A Link Between Training, Job Complexity, Decision Latitude, Leader–Member Exchange, and Performance

Previous research demonstrated that individuals differ in the relative sophistication of their schemas for organizing and interpreting social stimuli (i.e., attributional complexity, or AC) and that AC has been linked to performance in social situations. In the present study, 420 employed students completed surveys for an investigation of the relationship between individual, work role, and job characteristics; AC; and job performance. Educational level and major predicted AC, but leader–member exchange (LMX), decision latitude (DL), and social/task complexity of the job did not. Contrary to expectations, social and task complexity did not interact with DL and LMX to predict AC. AC, DL, LMX, and educational level predicted job performance. Further, AC interacted with social complexity of the job to predict performance. The results suggest that AC may be both content and process based, and predictive of performance in certain jobs.     

Gender Differences in Anticipated Salary: Role of Salary Estimates for Others,Job Characteristics,Career Paths,and Job Inputs

The purpose of this research was to compare pay expectations of women and men. Participants were 371 college students (261 women, 110 men; 94% White) from a variety of majors. Most students at this university are middle class. Consistent with prior research, women estimated significantly lower salaries at career entry and peak and rated family considerations and pleasant working conditions as significantly more important than did men. Men and women differed on salary estimates for others, influence of salary on decision to enter a field, time off for childrearing, career certainty, and weekly work hours. Controlling for average salaries in the listed job, job characteristic importance, career path, and job input differences eliminated the gender differences at entry and reduced the difference at peak.