上海市青少年心理适应性研究

心理适应是心理健康的外在表现,更是现代社会中个体心理健康的重要标志.为了了解处于社会迅速转型时期的国际大都市上海地区青少年心理适应的状况,在全国调查的背景下,通过对上海地区小学五年级至高中三年级1515名青少年的调查和对仝国数据的比较发现:(1)上海市青少年的心理适应性总体水平略低于全国;(2)存在显著的年级差异,但与全国不同的是初二年级的心理适应性最差;(3)适应性在总体上不存在性别差异,但是女生在生理适应方面显著高于男生,而男生在人际适应方面显著高于女生;(4)学校性质、年龄、性别、家庭所在地、父母受教育水平、家庭月收入等因素与青少年心理适应性密切相关.     

BDNF: a key regulator for protein synthesis-dependent LTP and long-term memory?

It is generally believed that late-phase long-term potentiation (L-LTP) and long-term memory (LTM) require new protein synthesis. Although the full complement of proteins mediating the long-lasting changes in synaptic efficacy have yet to be identified, several lines of evidence point to a crucial role for activity-induced brain-derived neurotrophic factor (BDNF) expression in generating sustained structural and functional changes at hippocampal synapses thought to underlie some forms of LTM. In particular, BDNF is sufficient to induce the transformation of early to late-phase LTP in the presence of protein synthesis inhibitors, and inhibition of BDNF signaling impairs LTM. Despite solid evidence for a critical role of BDNF in L-LTP and LTM, many issues are not resolved. Given that BDNF needs to be processed in Golgi outposts localized at the branch point of one or few dendrites, a conceptually challenging problem is how locally synthesized BDNF in dendrites could ensure synapse-specific modulation of L-LTP. An interesting alternative is that BDNF-TrkB signaling is involved in synaptic tagging, a prominent hypothesis that explains how soma-derived protein could selectively modulate the tetanized (tagged) synapse. Finally, specific roles of BDNF in the acquisition, retention or extinction of LTM remain to be established.     

Objects on a collision path with the observer demand attention

ABSTRACT— How observers distribute limited processing resources to regions of a scene is based on a dynamic balance between current goals and reflexive tendencies. Past research showed that these reflexive tendencies include orienting toward objects that expand as if they were looming toward the observer, presumably because this signal indicates an impending collision. Here we report that during visual search, items that loom abruptly capture attention more strongly when they approach from the periphery rather than from near the center of gaze (Experiment 1), and target objects are more likely to be attended when they are on a collision path with the observer rather than on a near-miss path (Experiment 2). Both effects are exaggerated when search is performed in a large projection dome (Experiment 3). These findings suggest that the human visual system prioritizes events that are likely to require a behaviorally urgent response.     

Adolescent Internet usage in Taiwan: exploring gender differences

The purpose of this study was to explore gender differences in adolescent Internet accessibility, motives for use, and online activities in Taiwan; 629 5th and 6th graders were surveyed. Findings revealed that the gap in gender differences with regard to Internet use has decreased in this generation. Even though the Internet is the most recent form of major media in the world, it has become the second most important medium as perceived by boys and girls. No gender difference was found in adolescents' motives for using the Internet.The ranking of relative importance of motives for adolescents going online was searching for information, followed by socializing, and boredom avoidance for both boys and girls. However, a gender difference in online activities seems to persist. Searching for homework information and playing games were the most popular online activities for all adolescents. However, while girls tended to view the Internet more as a means of searching for information and e-mailing friends, boys tended to use it more for playing games and down-loading software.     

Effects of Team Goal Interdependence on Newcomer Socialization: An Experiment in China1

Increased employee mobility and the widespread use of teams underline the importance of understanding the socialization of newcomers into groups. Applying the theory of cooperation and competition, this study experimentally investigated the relationship between team climate and newcomer socialization and performance. We found that a cooperative, in comparison to a competitive or independent team climate strengthened the relationship and interaction between newcomers and the other team members. Thereby, this facilitated newcomer socialization.     

Bayesian generic priors for causal learning

The article presents a Bayesian model of causal learning that incorporates generic priors--systematic assumptions about abstract properties of a system of cause-effect relations. The proposed generic priors for causal learning favor sparse and strong (SS) causes--causes that are few in number and high in their individual powers to produce or prevent effects. The SS power model couples these generic priors with a causal generating function based on the assumption that unobservable causal influences on an effect operate independently (P. W. Cheng, 1997). The authors tested this and other Bayesian models, as well as leading nonnormative models, by fitting multiple data sets in which several parameters were varied parametrically across multiple types of judgments. The SS power model accounted for data concerning judgments of both causal strength and causal structure (whether a causal link exists). The model explains why human judgments of causal structure (relative to a Bayesian model lacking these generic priors) are influenced more by causal power and the base rate of the effect and less by sample size. Broader implications of the Bayesian framework for human learning are discussed.     

3D mapping of language networks in clinical and pre-clinical Alzheimer's disease

We investigated the associations between Boston naming and the animal fluency tests and cortical atrophy in 19 probable AD and 5 multiple domain amnestic mild cognitive impairment patients who later converted to AD. We applied a surface-based computational anatomy technique to MRI scans of the brain and then used linear regression models to detect associations between animal fluency and Boston Naming Test (BNT) performance and cortical atrophy. The global permutation-corrected significance for the maps associating BNT performance with cortical atrophy was p=.0124 for the left and p=.0196 for the right hemisphere and for the animal fluency maps p=.055 for the left and p=.073 for the right hemisphere. The degree of language impairment correlated with cortical atrophy in the left temporal and parietal lobes (BA 20, 21, 37, 39, 40, and 7), bilateral frontal lobes (BA 8, 9, and 44) and the right temporal pole (BA 38). Using a novel 3D mapping technique, we demonstrated that in AD language abilities are strongly influenced by the integrity of the perisylvian cortical regions.     

Mortality of geriatric and younger patients with schizophrenia in the community

Little is known about the differences in mortality among non-institutionalized geriatric and younger patients with schizophrenia. In this study long-term mortality and suicidal behavior of all the geriatric (age > or = 65 years), middle-age (age 41-64 years), and young (age 15-40 years) subjects with schizophrenia living in a Chinese rural community were compared. A 10 year follow-up investigation among a 1994 cohort (n = 510) of patients with schizophrenia was conducted in Xinjin County, Chengdu, China. Compared with young subjects, geriatric subjects with schizophrenia were more likely to be female, have more previous physical illness, never accepted treatment, and practice religious (p < or = 0.01). There were no significant differences of suicide attempts among the three groups. Young subjects had a higher rate of suicide (1,033.8 per 100,000 person-years), and geriatric subjects had a higher rate of deaths due to other causes (accident and natural causes) (4,314.2 per 100,000 person-years). Standardized mortality ratios for both suicide and deaths due to other causes were highest in young subjects and the lowest in geriatric subjects. Patients with schizophrenia in all age groups had a marked increase in mortality and suicide. Specific intervention strategies for decreasing mortality and suicide should be developed for patients with schizophrenia in different age groups.     

Effects of an Extracurricular Science Intervention on Science Performance, Self-Worth, Social Skills, and Sexist Attitudes of Taiwanese Adolescents from Single-Parent Families

A one group pretest-posttest design was used to investigate effects of an extracurricular science intervention on female and male junior high school students’ science performance, self-worth, social skills, and sexist attitudes. Twenty-eight 8th grade Taiwanese students (16 boys, 12 girls) from single parent families participated in this study. Student responses to a questionnaire measuring their self-worth, social skills, and sexist attitudes, and interviews and classroom observations used for triangulation and consolidation of qualitative findings revealed that girls improved significantly on several indices of science performance, and that both boys and girls decreased their sexist attitudes. Girls had significantly less sexist attitudes than boys at both pretest and posttest. Implications for practice and research are provided.