First and second language in the brain: Neuronal correlates of language processing and spelling strategies

This study explores oscillatory brain activity by means of event-related synchronization and desynchronization (%ERS/ERD) of EEG activity during the use of phonological and orthographic-morphological spelling strategies in L2 (English) and L1 (German) in native German speaking children. EEG was recorded while 33 children worked on a task requiring either phonological or orthographic-morphological spelling strategies. L2 processing elicited more theta %ERS than L1 processing (particularly at bilateral frontal and right posterior parietal sites) which might suggest a stronger involvement of semantic encoding and retrieval of the less familiar L2. The highest level of theta %ERS was revealed for the orthographic-morphological strategy in L2 which might indicate a more intense way of lexical retrieval compared to the phonological strategy in L2 and the orthographic-morphological strategy in L1. Analyses moreover revealed that phonological processing (both in L1 and L2) was associated with comparatively strong left-hemispheric %ERD in the upper alpha frequency band.     

Neural correlates of stimulus response and stimulus outcome shifting in healthy participants and MS patients

Introduction

Adaptation to changing situations can be mediated by two strategies: (1) Evaluation of a response and (2) Evaluation of outcome values in relation to objects. Previous studies indicate that response shifting is associated with a network comprising the left frontal cortex and parietal cortex connected by the superior longitudinal fascicle, whereas outcome evaluation is associated with a network consisting of the orbitofrontal cortex, amygdala and uncinate fascicle. However, these studies rarely compared both kinds of adaptation directly and existing fMRI studies with healthy subjects are not informative about the role of the two fiber systems.

Methods

We analyzed stimulus response shifting and stimulus outcome shifting in two studies, one fMRI-study on healthy participants and one study on patients with MS involving structural MRI (Diffusion Tensor Imaging, Voxel Based Morphometry, Ventricular volumetry). Two tasks were used, identical in presentation but different in instruction, controlling for effects of lower level processing. In the SRS task, participants had to perform a “Go” or “NoGo” response depending on a stimulus change: if the stimulus remained the same, they had to continue with the former type of response, if it changed they had to adapt their response pattern. In the SOS task they had to perform a “Go” response only if the presented stimulus corresponded to that of an internal alternating series.

Results

fMRI findings showed that SRS is related to a bilateral parietal-premotor network. In the left hemisphere the prefrontal cortex was also involved. SOS was lateralized to the right hemisphere, particularly to the anterior temporal pole and amygdala, and the inferior parietal cortex. MS patients impaired on this task suffered from lesions in the right uncinate fascicle and showed an enlarged right frontal lateral ventricle.

Conclusion

With physically identical tasks, a functional neuronal segregation can be demonstrated for stimulus response shifting (bilateral activations with a focus in the left prefrontal cortex) and stimulus outcome shifting (right anterior temporal lobe and right supramarginal gyrus).     

Evolutionary Psychology of Facial Attractiveness

The human face communicates an impressive number of visual signals. Although adults' ratings of facial attractiveness are consistent across studies, even cross-culturally, there has been considerable controversy surrounding attempts to identify the facial features that cause faces to be judged attractive or unattractive. Studies of physical attractiveness have attempted to identify the features that contribute to attractiveness by studying the relationships between attractiveness and (a) symmetry, (b) averageness, and (c) nonaverage sexually dimorphic features (hormone markers). Evolutionary psychology proposes that these characteristics all pertain to health, suggesting that humans have evolved to view certain features as attractive because they were displayed by healthy individuals. However, the question remains how single features that are considered attractive relate to each other, and if they form a single ornament that signals mate quality. Moreover, some researchers have recently explained attractiveness preferences in terms of individual differences that are predictable. This article briefly describes what is currently known from attractiveness research, reviews some recent advances, and suggests areas for future researchers' attention.     

Relational aggression in college students: Examining the roles of social anxiety and empathy

This study examined the unique contributions of social anxiety and empathy to relational aggression in 300 19–to–25–year–old (M=21.25; SD=1.32) male (n=97) and female (n=203) college students using hierarchical linear regression analysis. The interactive relations between gender and social anxiety, and between gender and empathy, were also assessed. In addition to the gender and overt aggression covariates, fear of negative evaluation and perspective taking were unique predictors of relational aggression. Males, students who were more overtly aggressive, and those who reported greater fear of negative evaluation were more relationally aggressive than were peers. Students with higher levels of perspective taking reported using less relational aggression than did peers. A gender x empathetic concern interaction indicated that for males only, lower levels of empathetic concern were associated with higher levels of relational aggression. Results are discussed within a social information‐processing perspective. Aggr. Behav. 29:430–439, 2003. © 2003 Wiley‐Liss, Inc.     

The Ladder of Rationality

This paper is a review and critical discussion of John Broome’s Rationality Through Reasoning. In particular, it engages critically with (i) Broome’s view on the independence of normative reasons and rationality, (ii) his construal of the capacity, property, and requirement senses of “rationality”, and (iii) his account of reasoning as a conscious, rule-following operation on mental contents.     

Life events as predictors of mania and depression in bipolar I disorder

To date, few prospective studies of life events and bipolar disorder are available, and even fewer have separately examined the role of life events in depression and mania. The goal of this study was to prospectively examine the role of negative and goal-attainment life events as predictors of the course of bipolar disorder. One hundred twenty-five individuals with bipolar I disorder were interviewed monthly for an average of 27 months. Negative and goal-attainment life events were assessed with the Life Events and Difficulties Schedule. Changes in symptoms were evaluated using the Modified Hamilton Rating Scale for Depression and the Bech-Rafaelsen Mania Scale. The clearest results were obtained for goal-attainment life events, which predicted increases in manic symptoms over time. Negative life events predicted increases in depressive symptoms within regression models but were not predictive within multilevel modeling of changes in depressive symptoms. Given different patterns for goal attainment and negative life events, it appears important to consider specific forms of life events in models of bipolar disorder.     

Decreased locomotor and investigatory exploration after denervation of catecholamine terminal fields in the forebrain of rats.

Exploratory behaviors were examined after bilateral microinjections of 6-hydroxydopamine into two hypothalamic sites that produced different patterns of denervation of forebrain catecholamine terminal fields. After anterolateral injections rats locomoted and reared less in a novel open field, responded abnormally to changes in the degree of novelty of the open field, and investigated a novel object less. These are deficits in exploratory behavior because they were not secondary to the inhibition of open-field behavior by hyperemotionality, by general motor disability, or by the failure to detect novel spaces or objects. Such anterolateral injections produced loss of catecholamine fibers, determined histochemically, in neocortical, hippocampal, anterolateral hypothalamic, mesolimbic, mesocortical, and anteromedioventral striatal terminal fields and loss of dopaminergic perikarya in the A10 and anteromedial A9 cell groups. No deficits in exploratory behaviors occurred, however, after bilateral anteromedial 6-hydroxydopamine injections that denervated neocortical, hippocampal, and anteromedial hypothalamic catecholamine terminal fields. A critical forebrain catecholaminergic innervation for exploratory responses to novel stimuli may be within areas that were denervated by anterolateral but not by anteromedial hypothalamic 6-nydroxydopamine injections. These areas are mesolimbic, mesocortical, anteromedioventral, and anterolateral hypothalamic terminal fields.     

Contact with bisexual individuals reduces binegativity among heterosexuals and lesbian women and gay men

Although binegativity, the stigmatization of bisexuality, is prevalent among heterosexual and lesbian and gay communities, little research has addressed how the quantity and quality of intergroup contact affect binegativity. Drawing on intergroup contact theory, this study examined contact with and attitudes toward bisexuals among heterosexual undergraduates, heterosexual adults, and lesbians and gay men. Knowing more bisexuals (quantity) predicted more positive attitudes toward and decreased intergroup anxiety with male and female bisexuals. A multilevel structural equation model indicated that contact quality simultaneously predicted higher perceived stability of female bisexuality (but not male bisexuality) and tolerance of and less intergroup anxiety with male and female bisexuals when contact quantity was controlled for. This research suggests that both quantity and quality of contact with bisexuals predicts improved intergroup attitudes. Implications for future research on reducing binegativity are discussed.     

Ventral tegmental area and substantia nigra neural correlates of spatial learning

The ventral tegmental area (VTA) and substantia nigra pars compacta (SNc) may provide modulatory signals that, respectively, influence hippocampal (HPC)- and striatal-dependent memory. Electrophysiological studies investigating neural correlates of learning and memory of dopamine (DA) neurons during classical conditioning tasks have found DA neural activity in VTA and SNc to be tightly coupled with reinforcement expectations. Also, VTA integrity and DA in HPC have been found to regulate the encoding of HPC-dependent memories. Therefore, to determine the nature of the neural code HPC may receive from midbrain DA regions, the present study investigated VTA and SNc neural activity as navigating rats engaged in new spatial learning and experienced changes in expected goal locations. VTA and SNc cells were differentially engaged during training to a series of three novel goal locations. During task acquisition, the peak firing rates of VTA neurons decreased at the time of reward and shifted to time points before reward retrieval, whereas the peak firing rates of SNc neurons remained elevated at the time of reward during training to all three goal locations. Both VTA and SNc egocentric coding was strongest during training to the first goal location, which coincided with the time subjects learned the behavioral rules specific to the task. These data imply that VTA and SNc play complementary yet distinct roles in spatial learning to optimize adaptive behavior.