Keeping track of where we are: Spatial working memory in navigation

Spatial working memory (WM) seems to include two types of spatial information: locations and relations. However, this distinction has been based on small-scale tasks. Here, we used a virtual navigation paradigm to examine whether WM for locations and relations applies to the large-scale spatial world. We found that navigators who successfully learned two routes and also integrated them were superior at maintaining multiple locations and multiple relations in WM. However, over the entire spectrum of navigators, WM for spatial relations, but not locations, was specifically predictive of route integration performance. These results lend further support to the distinction between these two forms of spatial WM and point to their critical role in individual differences in navigation proficiency.     

Associations Between Family Environment, Parenting Practices, and Executive Functioning of Children with and Without ADHD

We examined the relationships between executive functioning, family environment, and parenting practices in children diagnosed with ADHD as compared to children without ADHD. Participants were parents (N = 134) of 6- to 12-year-old ADHD and non-ADHD-diagnosed children. Compared to the control group, parents of children diagnosed with ADHD reported their children as exhibiting greater problems with behavioral control and metacognitive abilities, and described their family environments as less organized and higher in family conflict. Family environment and parenting practices were not correlated with behavioral control or metacognitive abilities in children with ADHD. In children without ADHD, higher levels of family cohesion, organization, and expressiveness, and lower levels of family conflict, were significantly correlated with greater behavioral control. Higher levels of family cohesion and organization were significantly and positively associated with regulation of metacognitive abilities in children without ADHD. In general, aspects of the family environment and parental limit setting appear to be associated with the development of executive functions in children not diagnosed with ADHD; however, family environment and parenting practices were not associated with executive functions in children diagnosed with ADHD.     

Cue effects on memory for location when navigating spatial displays

Participants maneuvered a rat image through a circular region on the computer screen to find a hidden target platform, blending aspects of two well-known spatial tasks. Like the Morris water maze task, participants first experienced a series of learning trials before having to navigate to the hidden target platform from different locations and orientations. Like the dot-location task, they determined the location of a position within a two-dimensional circular region. This procedure provided a way to examine how the number of surrounding cues (1, 2, or 3) affects the memory for spatial location in navigation. Memory performance was better when there were more cues and when targets were close to cues, consistent with the idea that cues bolster fine-grain memory, especially in proximal regions. Early and late measures of bias in memory reflected biases in a direction toward the nearest cue, implicating a cue-based category structure of the navigational space. Collectively, results suggest cue-based spatial memory representations that have been inferred from the dot-location task generalize to a navigation task within a simple, computer-based environment, as demonstrated by the good fits of the spatial model developed for the dot-location task ( Fitting, Wedell, & Allen, 2005, 2007 ).     

Beyond genetic explanations for leadership: The moderating role of the social environment

Leadership role occupancy has recently been shown to have a genetic basis. We extend prior research by examining the moderating effects of the social environment during adolescence on the genetic influences on leadership role occupancy at work. Utilizing a sample of male twins (89 pairs of identical and 54 pairs of fraternal twins, with a mean age of 36.5 years), we found that genetic influences are weaker for those reared in enriched environments (i.e., higher family socioeconomic status, higher perceived parental support, and lower perceived conflict with parents). For those twins who had relatively poorer social environments, genetic influences on leadership role occupancy are significantly greater. These results have important implications for early interventions on leadership development inside and outside organizations.     

Beyond Heritability: Twin Studies in Behavioral Research

ABSTRACT— The heritability of human behavioral traits is now well established, due in large measure to classical twin studies. We see little need for further studies of the heritability of individual traits in behavioral science, but the twin study is far from having outlived its usefulness. The existence of pervasive familial influences on behavior means that selection bias is always a concern in any study of the causal effects of environmental circumstances. Twin samples continue to provide new opportunities to identify causal effects with appropriate genetic and shared environmental controls. We discuss environmental studies of discordant twin pairs and twin studies of genetic and environmental transactions in this context.     

Effects of Prenatal Social Stress on Offspring Development: Pathology or Adaptation?

ABSTRACT— In nonhuman mammals, the social environment in which pregnant females live is critical for their offsprings' brain development, endocrine state, and social and sexual behavior later in life. Social instability during pregnancy generally brings about a behavioral and neuroendocrine masculinization in daughters and a less pronounced expression of male-typical traits in sons. We favor the hypothesis that such behavioral effects of prenatal social stress are not necessarily "pathological" (nonadaptive) consequences of adverse social conditions. Rather, pregnant mothers could be adjusting their offspring to their environment in an adaptive way.     

Social regulation of human gene expression

ABSTRACT— The relationship between genes and social behavior has historically been construed as a one-way street, with genes in control. Recent analyses have challenged this view, by discovering broad alterations in the expression of human genes as a function of differing socio-environmental conditions. The emerging field of social genomics has begun to identity the types of genes subject to social regulation, the biological signaling pathways mediating those effects, and the genetic polymorphisms that moderate socioenvironmental influences on human gene expression.     

小学教师选择注意与洞察力对课堂信息知觉的影响

选择注意和洞察力在教师课堂信息加工过程中起着十分重要的作用.本研究基于以往教师教学专长发展的理论,对选择注意与洞察力对教师课堂信息知觉加工速度与辨别力进行探讨.研究结果表明:选择注意与洞察力呈现显著正相关;选择性编码与选择性比较对课堂信息加工速度起着重要的作用;选择注意对教师课堂信息判断的正确率起着重要的作用;选择性联合对三类课堂信息加工速度与辨别力的影响均不显著.     

家庭文化背景在儿童阅读发展中的作用

通过问卷调查和测验方法探讨了家庭文化背景与儿童阅读发展的关系。回归模型表明家庭文化背景对一、四年级儿童的阅读成就都有显著影响。路径分析进一步表明：仅父母与孩子问的文化活动对一年级儿童的阅读成就有直接影响,而家庭文化背景的四个方面相对独立地对四年级儿童的阅读发展产生影响。