Positive moods can eliminate intentional forgetting

People can intentionally forget previously studied information if, after study, a forget cue and new material to be encoded are provided. We examined how the affective state people experience during encoding of the new material modulates such directed forgetting. Positive, negative, and neutral moods were induced immediately before the new material was studied. The study materials themselves were neutral. The results showed sustained forgetting of the previously studied materials in negative moods but an elimination of the forgetting in positive moods. These findings agree with the effects of mood found for other cognitive tasks. They suggest that in positive moods, associative networks are activated, which leads to reactivation of List-1 items, and thus to elimination of the directed forgetting effects. These results contrast with recent reports on the role of emotional content in directed forgetting, which have described equivalent effects for neutral and emotional materials. Together, our findings suggest that directed forgetting is mainly affected by mood, and hardly at all by emotional content.     

When thinking is beneficial and when it is not: The effects of thin and round advertising models

This study addresses the advertising effectiveness of round and thin models. Integrating previous findings and theories, the authors predict and find that impulsive and reflective product evaluations as responses to thin and round advertisement models diverge. Specifically, four experiments indicate that impulsive product evaluations follow a priming logic, such that the beauty of the model spills over directly onto product evaluations; thin models thus produce more favorable implicit responses than do round models. For reflective product evaluations however, this pattern appears reversed. Moreover, these explicit product evaluations are mediated by campaign liking.     

Behavioral deficits and subregion-specific suppression of LTP in mice expressing a population of mutant NMDA receptors throughout the hippocampus

The NMDA receptor (NMDAR) subunit GluN1 is an obligatory component of NMDARs without a known functional homolog and is expressed in almost every neuronal cell type. The NMDAR system is a coincidence detector with critical roles in spatial learning and synaptic plasticity. Its coincidence detection property is crucial for the induction of hippocampal long-term potentiation (LTP). We have generated a mutant mouse model expressing a hypomorph of the Grin1^N598R allele, which leads to a minority (about 10%) of coincidence detection-impaired NMDARs. Surprisingly, these animals revealed specific functional changes in the dentate gyrus (DG) of the hippocampal formation. Early LTP was expressed normally in area CA1 in vivo, but was completely suppressed at perforant path-granule cell synapses in the DG. In addition, there was a pronounced reduction in the amplitude of the evoked population spike in the DG. These specific changes were accompanied by behavioral impairments in spatial recognition, spatial learning, reversal learning, and retention. Our data show that minor changes in GluN1-dependent NMDAR physiology can cause dramatic consequences in synaptic signaling in a subregion-specific fashion despite the nonredundant nature of the GluN1 gene and its global expression.According to Hebb''s postulate, neurons require a molecular mechanism to detect synchronous activity in order to change the strength of synaptic connectivity (Hebb 1949). NMDA receptors (NMDARs) are molecular coincidence detectors, and selective NMDAR antagonists block the induction of long-term potentiation (LTP) in both the dentate gyrus (DG) and CA1 regions of the hippocampus (Bliss and Collingridge 1993; Martin et al. 2000). NMDARs have been long known for their role in spatial learning, but more recently have been implicated in other forms of cognitive function and dysfunction (Gruart et al. 2006; Whitlock et al. 2006; Castner and Williams 2007; Kristiansen et al. 2007; Wilson and Linster 2008).Neuronal NMDARs are hetero-tetrameric ligand-gated ion channels typically comprised of two types of subunits. Two copies of the mandatory GluN1 subunit (or NR1 subunit [Collingridge et al. 2009] encoded by Grin1) are associated with two copies from the GluN2 family, GluN2A–D (or NR2A–D). The GluN1 subunit is expressed ubiquitously both spatially and temporally throughout the developing and adult brain. Global knockout mice models of the GluN1 subunit are postnatally lethal within hours after birth (Forrest et al. 1994; Li et al. 1994), and cell-specific GluN1 mice knockouts (Tsien et al. 1996; Nakazawa et al. 2002; McHugh et al. 2007; Niewoehner et al. 2007) have provided insights on how specific synapses and regional neuronal networks are dependent on NMDAR function.The early postnatal lethality of the global GluN1 knockout is in contrast to the null mutants of the four AMPA receptor genes and other major synaptic proteins, such as αCaMKII (Silva et al. 1992a,b; Jia et al. 1996; Zamanillo et al. 1999; Meng et al. 2003). This can be at least partially explained by the absence of any close GluN1 homologs, which could functionally compensate for the absence of the GluN1 subunit. Recombinant expression studies defined the GluN1 subunit as a mandatory component of NMDARs. This constellation provides a specific opportunity to test whether different local neuronal subnetworks are affected differentially by mutant Grin1 alleles associated with subtle alterations of the functional properties of NMDARs.GluN1 subunits with the N598R point mutation (GluN1^R) yield functional NMDARs that are Mg²⁺ insensitive and Ca²⁺ impermeable (Burnashev et al. 1992; Mori et al. 1992). The Grin1^N598R allele that codes for GluN1^R subunits is a gain-of-function mutation that is dominant lethal, even in heterozygous and hemizygous lines (Single et al. 2000; Rudhard et al. 2003). NMDARs with GluN1^R subunits do not act as coincidence detectors and, interestingly, mice expressing exclusively the GluN1^R allele lack whisker-related pattern formation in the neonate brainstem (Rudhard et al. 2003).To investigate the functional importance of GluN1 subunits with the N598R point mutation, we took advantage of the generation of a variant mutant line of mice (GluN1^Rneo/+) expressing a minority (around 10%) of these mutant NMDARs. Even though the majority of the NMDARs are normal, all neurons expressing NMDARs will contain a subset of receptors carrying this mutation.Therefore, this mouse model is an ideal candidate to study the impact of subtle alterations of NMDAR function on different neuronal networks, such as those comprising the hippocampal formation.Studies examining region-specific targeted disruption of GluN1 expression in subregions of the hippocampus have revealed subtle yet important contributions of this NMDAR subunit in synaptic plasticity and spatial learning and memory. CA1-restricted knockout of GluN1 expression in the hippocampus caused impaired spatial learning and memory as well as reduced CA1-LTP (Tsien et al. 1996). In the case of the disruption of GluN1 expression in the DG region of the hippocampus, more subtle behavioral impairments were apparent, including the inability to discriminate between two similar contexts (pattern separation) and deficits in spatial working memory despite normal LTP in the CA1 region (McHugh et al. 2007; Niewoehner et al. 2007).Our GluN1^Rneo/+ mice differ from the region-specific GluN1 mutant mice in that they express the mutant hypomorph at the same level in different subregions of the hippocampus. Interestingly, we found that this allele leads to substantial differences in short- and long-term plasticity between area CA1 and the DG of the hippocampus. The specific impairment in the DG was accompanied by impaired spatial recognition, spatial learning, reversal learning, and retention. Our data establish the possibility of a circuit-specific phenotype caused by a mutant variant of a globally expressed major nonredundant synaptic protein.     

How stable is sense of coherence? Changes following an intervention for unemployed individuals

The present investigation was concerned with the changeability of sense of coherence. We examined changes in sense of coherence (SOC) over a six-month period in a sample of Finnish unemployed individuals ( n = 74) participating in an intervention program designed to boost re-employment. Over the study period, participants' sense of coherence improved significantly and re-employed individuals reported the greatest changes. Different changes in the subcomponents of SOC, comprehensibility, manageability and meaningfulness, were found. Contrary to expectations, participants younger than 30 years of age did not show greater changes in their SOC. Initial personal resources were predictors of both positive and negative changes in SOC.     

Emotion control in collaborative learning situations: Do students regulate emotions evoked by social challenges/

Background During recent decades, self‐regulated learning (SRL) has become a major research field. SRL successfully integrates the cognitive and motivational components of learning. Self‐regulation is usually seen as an individual process, with the social aspects of regulation conceptualized as one aspect of the context. However, recent research has begun to investigate whether self‐regulation processes are complemented by socially shared regulation processes. Aims The presented study investigated what kind of socio‐emotional challenges students experience during collaborative learning and whether the students regulate the emotions evoked during these situations. The interplay of the emotion regulation processes between the individual and the group was also studied. Sample The sample for this study was 63 teacher education students who studied in groups of three to five during three collaborative learning tasks. Method Students' interpretations of experienced social challenges and their attempts to regulate emotions evoked by these challenges were collected following each task using the Adaptive Instrument for the Regulation of Emotions. Results The results indicated that students experienced a variety of social challenges. Students also reported the use of shared regulation in addition to self‐regulation. Finally, the results suggested that intrinsic group dynamics are derived from both individual and social elements of collaborative situations. Conclusion The findings of the study support the assumption that students can regulate emotions collaboratively as well as individually. The study contributes to our understanding of the social aspects of emotional regulation in collaborative learning contexts.     

Behavioral genetic analyses of prosocial behavior in adolescents

Prosocial behavior is an important aspect of normal social and psychological development. Adult and child twin studies typically estimate the heritability of prosocial behavior to be between 30 and 50%, although relatively little is known about genetic and environmental influences upon prosocial behavior in adolescence. We therefore examined reports of prosocial behavior in a large longitudinal family study of 1160 adolescent twin pairs (aged between 13 and 19 years). Prosocial behavior was assessed at two time points by self‐report and at the second time point by additional parent‐ratings using the Strengths and Difficulties Questionnaire (SDQ; Goodman, 1997 ). Adolescent females were reported to be significantly more prosocial than males (p < .001). Univariate analyses primarily showed moderate heritability and large nonshared environmental influences. There was a moderate genetic correlation between self‐ and parent‐reported prosocial behaviour, suggesting that both types of rater were tapping into genetically overlapping constructs. Longitudinal analyses revealed that continuity was largely explained by genes. Unique environmental influences were predominantly time‐specific and were the major source of individual differences.     

Change in school ethnic diversity and intergroup relations: The transition from segregated elementary to mixed secondary school for majority and minority students

This research examined the impact of a change in school diversity on school children's intergroup relations. A longitudinal survey tracked 551 White British and Asian British students (M_age = 11.32) transitioning from elementary (time 1) to secondary (time 2) school in an ethnically segregated town in the United Kingdom. We estimated a multivariate, multilevel model. A cross-sectional comparison of segregated schools and a mixed elementary school at time 1 revealed that both Asian and White British in the mixed school reported more positive intergroup relations. A longitudinal analysis found that the transition from segregated elementary to mixed secondary schools was associated with Asian British developing more positive intergroup relations. White British reported overall less positive intergroup relations, although only trust decreased; evidence from other measures remains inconclusive. The findings are important for understanding early stages of diversity exposure, and the impact of changing diversity levels on majority and minority groups.     

The how and the when of the social cure: A conceptual model of group- and individual-level mechanisms linking social identity to health and well-being

In this article, we aim at theoretical specification and integration of mechanisms proposed within the Social Identity Approach to Health and Well-being. We differentiate group-level and individual-level effects of shared social identity by distinguishing three different aspects: individual identification, group identification, and individually perceived group identification. We discuss specific group-level mechanisms (i.e., mutual social support and collective self-efficacy) and individual level-mechanisms (i.e., attribution and appraisal processes regarding stressors and resources) for each of the three aspects. A core conclusion is that the positive effects of shared social identity on health and well-being crucially depend on its close relationship with social support, and that although social support is an interindividual phenomenon, it is intraindividual mechanisms—attribution and appraisal—that shape the psychological partnership between social identity and social support. Therefore, we put special emphasis on cross-level interactions between group- and individual-level mechanisms, which have been widely neglected in earlier research.     

How situational activation of values evokes positive and negative feelings: Theory and experimental findings

Motivation and Emotion - We propose a theory of how situational activation of values evokes positive and negative feelings. In conjunction we present a re-conceptualization of Schwartz’ et...     

Affirmation and Denial in Aristotle’s De interpretatione

Topoi - Modern logicians have complained that Aristotelian logic lacks a distinction between predication (including negation) and assertion, and that predication, according to the Aristotelians,...