Age-related impairment in the 250-millisecond delay eyeblink classical conditioning procedure in C57BL/6 mice

In this study we tested 4-, 9-, 12-, and 18-month-old C57BL/6 mice in the 250-msec delay eyeblink classical conditioning procedure to study age-related changes in a form of associative learning. The short life expectancy of mice, complete knowledge about the mouse genome, and the availability of transgenic and knock-out mouse models of age-related impairments make the mouse an excellent species for expanding knowledge on the neurobiologically and behaviorally well-characterized eyeblink classical conditioning paradigm. Based on previous research with delay eyeblink conditioning in rabbits and humans, we predicted that mice would be impaired on this cerebellar-dependent associative learning task in middle-age, at ~9 months. To fully examine age differences in behavior in mice, we used a battery of additional behavioral measures with which to compare young and older mice. These behaviors included the acoustic startle response, prepulse inhibition, rotorod, and the Morris water maze. Mice began to show impairment in cerebellar-dependent tasks such as rotorod and eyeblink conditioning at 9 to 12 months of age. Performance in hippocampally dependent tasks was not impaired in any group, including 18-month-old mice. These results in mice support results in other species, indicating that cerebellar-dependent tasks show age-related deficits earlier in adulthood than do hippocampally dependent tasks.     

Behavioral and neurophysiological correlates of episodic coding,proactive interference,and list length effects in a running span verbal working memory task

Updating refers to (1) discarding items from, (2) repositioning items in, and (3) adding items to a running working memory span. Our behavioral and fMRI experiments varied three factors: trial length, proactive interference (PI), and group integrity. Group integrity reflected whether the grouping of items at the encoding stage was violated at discarding. Behavioral results were consistent with the idea that updating processes have a relatively short refractory period and may not fatigue, and they revealed that episodic information about group context is encoded automatically in working memory stimulus representations. The fMRI results did not show evidence that updating requirements in a task recruit executive control processes other than those supporting performance on nonupdating trials. They did reveal an item-accumulation effect, in which signal increased monotonically with the number of items presented during the trial, despite the insensitivity of behavioral measures to this factor. Behavioral and fMRI correlates of PI extended previous results and rejected an alternative explanation of PI effects in working memory.     

Mementos and the endowment effect

This research provides evidence for a new moderator of the endowment effect: having a memento of the endowed object. Three studies adapting classic endowment effect paradigms and using a variety of endowment objects and mementos demonstrate that having a memento of an endowment increases willingness to trade the endowment and decreases selling prices for the endowment. We provide evidence that mementos attenuate the endowment effect regardless of whether the memento is a separate small gain when facing the loss of the endowment or a small part of the original endowment that is kept. Examining mementos in context of the endowment effect not only provides insight into the psychology underlying the reluctance to part with one's endowment but also other consumer disposition behaviors.     

Brain and behavioral inhibitory control of kindergartners facing negative emotions

Inhibitory control (IC) – one of the most critical functions underlying a child's ability to self‐regulate – develops significantly throughout the kindergarten years. Experiencing negative emotions imposes challenges on executive functioning and may specifically affect IC. In this study, we examined kindergartners' IC and its related brain activity during a negative emotional situation: 58 children (aged 5.5–6.5 years) performed an emotion‐induction Go/NoGo task. During this task, we recorded children's performance and brain activity, focusing on the fronto‐central N2 component in the event‐related potential (ERP) and the power of its underlying theta frequency. Compared to Go trials, inhibition of NoGo trials was associated with larger N2 amplitudes and theta power. The negative emotional experience resulted in better IC performance and, at the brain level, in larger theta power. Source localization of this effect showed that the brain activity related to IC during the negative emotional experience was principally generated in the posterior frontal regions. Furthermore, the band power measure was found to be a more sensitive index for children's inhibitory processes than N2 amplitudes. This is the first study to focus on kindergartners' IC while manipulating their emotional experience to induce negative emotions. Our findings suggest that a kindergartner's experience of negative emotion can result in improved IC and increases in associated aspects of brain activity. Our results also suggest the utility of time‐frequency analyses in the study of brain processes associated with response inhibition in young children.     

Effective Challenge Regulation Coincides with Promotion Focus-Related Success and Emotional Well-Being

Beyond a hedonic model of the good life—approach pleasure and avoid pain—evidence is accumulating across species that well-being depends on potentially painful goal pursuit processes, like effort, engagement, and discovery. We hypothesized that daily challenges may provide a unique opportunity to fulfill such processes and that challenges would be more relevant within the promotion (gain-focused) than prevention (nonloss-focused) motivational system. Accordingly, we predicted that: (1) individuals who tend to be successful versus unsuccessful in achieving promotion-type goals would be better at managing daily challenges; and (2) challenge dysregulation would undermine promotion-related well-being (depressive symptoms) more than prevention-related well-being (anxiety symptoms). Across three studies, we find evidence in support of these hypotheses. Notably, as we find consistent evidence that too many and too few challenges may be damaging to mental health, we conclude that effective challenge regulation—not minimization—is likely to be a necessary component of optimal well-being.     

Adolescent Dating Violence: Application of a U.S. Primary Prevention Program in St. Lucia

The purpose of this study was to examine the Choose Respect dating violence prevention program (Centers for Disease Control and Prevention, 2006b , n.d.‐a) with secondary students in St. Lucia. Multivariate analysis of variance results indicated that the Choose Respect program had a positive influence on participants’ attitudes about control in relationships. Significant gender and school effects were found. Implications of these findings for primary prevention efforts targeting dating violence in St. Lucia and limitations of the study are discussed.     

Women’s Ideals for Masculinity Across Social Contexts: Patriarchal Agentic Masculinity is Valued in Work,Family, and Romance but Communal Masculinity in Friendship

The present study explores women’s ideals for masculinity in different social contexts (work, family/romance, and friendship) and compares how traditional (agentic) and non-patriarchal (communal) masculinity are valued in each context. Survey data were collected from one international (N = 159) and three South African samples (Ns = 86, 100, 161) of women. Results show that although women value patriarchal ideals for masculinity, agentic and communal versions of masculinity are valued differently across contexts. Specifically, traditional agentic versions of masculinity were most valued in the contexts most important to the long-term production of viable identity (family/romance and work). It was only in friendship that non-patriarchal communal masculinity was consistently idealized over traditional agentic masculinity. The results are discussed in relation to hegemonic masculinity (HM) and system justification theory (SJT). Congruent with SJT, women idealized versions of masculinity that may not be in their own or their group’s best interests, but in line with HM, the results emphasized the fluidity of masculinity and that the same individual can simultaneously idealize different versions of masculinity depending on the context. Because stereotypes are both explanations for the status quo and warrants for behaving in one way or another, these collective ideals for masculinity and contextual boundaries may be important obstacles to achieving gender equity.