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231.
To investigate attentional shifting in perihand space, we measured performance on a covert visual orienting task under different hand positions. Participants discriminated visual shapes presented on a screen and responded using footpedals placed under their right foot. With the right hand positioned by the right side of the screen, mean cueing effects were significantly greater for targets presented on the right compared to the left side, at the shortest stimulus onset asynchrony. The right hand still affected attention when the left foot was used to respond and when the right hand was crossed over the midline, indicating that this effect is not restricted to the right hemifield and cannot be accounted for by greater stimulus–response compatibility with the right (responding) foot. These experiments provide preliminary evidence that the presence of the right hand can modulate shifts of visual attention but emphasise the importance of stimulus–response compatibility effects in such investigations.  相似文献   
232.
A large community-based sample of Russian youths (n = 841, age M = 13.17 years, SD = 2.51) was assessed with the Child Behavior Checklist (mothers and fathers separately), Teacher's Report Form, and Youth Self-Report. The multiple indicator-version of the correlated trait-correlated method minus one, or CT-C(M - 1), model was applied to analyze (a) the convergent and divergent validity of these instruments in Russia, (b) the degree of trait-specificity of rater biases, and (c) potential predictors of rater-specific effects. As expected, based on the published results from different countries and in different languages, the convergent validity of the instruments was rather high between mother and father reports, but rather low for parent, teacher, and self-reports. For self- and teacher reports, rater-specific effects were related to age and gender of the children for some traits. These results, once again, attest to the importance of incorporating information from multiple observers when psychopathological traits are evaluated in children and adolescents.  相似文献   
233.
A considerable number of studies have recently used event-related potentials (ERPs) to investigate the mechanisms underlying error processing. Nevertheless, how these mechanisms are associated with behavioral adjustments following errors remains unclear. In the present study, we investigated how posterror slowing is linked to outcome expectations and error feedback. We used an adaptive four-choice reaction time task to manipulate outcome expectancy. Behaviorally, the results show posterror slowing when errors are unexpected and postcorrect slowing when correct responses are unexpected, indicating that outcome expectancy is crucial for posterror slowing. ERP analyses revealed that the error-related negativity and the feedback-related negativity were not correlated with the behavioral reaction time pattern, whereas the P3 was. The results support the hypothesis that posterror slowing is caused by attentional orienting to unexpected events.  相似文献   
234.
Predictors of HIV-related stigma among young people living with HIV.   总被引:2,自引:0,他引:2  
Enacted and perceived HIV stigma was examined among substance-using young people living with HIV (YPLH) in Los Angeles, San Francisco, and New York City (N = 147). Almost all YPLH (89%) reported perceived stigma, and 31% reported enacted experiences in the past 3 months; 64% reported experiences during their lifetime. The HIV stigma questions were characterized by factors of avoidance, social rejection, abuse, and shame. In multivariate models, enacted stigma was associated with gay or bisexual identity, symptomatic HIV or AIDS, and bartering sex. Perceived stigma was associated with female gender, symptomatic HIV or AIDS, bartering sex, lower injection drug use, and fewer friends and family knowing serostatus. Gay or bisexual YPLH who were also HIV symptomatic or AIDS diagnosed experienced more HIV stigma than their heterosexual peers.  相似文献   
235.
Abnormal balance in individuals suffering from traumatic brain injury (TBI) has been documented in numerous recent studies. However, specific mechanisms causing balance deficits have not been systematically examined. This paper demonstrated the destabilizing effect of visual field motion, induced by virtual reality graphics in concussed individuals but not in normal controls. Fifty five student-athletes at risk for concussion participated in this study prior to injury and 10 of these subjects who suffered MTBI were tested again on day 3, day 10, and day 30 after the incident. Postural responses to visual field motion were recorded using a virtual reality (VR) environment in conjunction with balance (AMTI force plate) and motion tracking (Flock of Birds) technologies. Two experimental conditions were introduced where subjects passively viewed VR scenes or actively manipulated the visual field motion. Long-lasting destabilizing effects of visual field motion were revealed, although subjects were asymptomatic when standard balance tests were introduced. The findings demonstrate that advanced VR technology may detect residual symptoms of concussion at least 30 days post-injury.  相似文献   
236.
The ability to detect social signals represents a first step to enter our social world. Behavioral evidence has demonstrated that 6‐month‐old infants are able to orient their attention toward the position indicated by walking direction, showing faster orienting responses toward stimuli cued by the direction of motion than toward uncued stimuli. The present study investigated the neural mechanisms underpinning this attentional priming effect by using a spatial cueing paradigm and recording EEG (Geodesic System 128 channels) from 6‐month‐old infants. Infants were presented with a central point‐light walker followed by a single peripheral target. The target appeared randomly at a position either congruent or incongruent with the walking direction of the cue. We examined infants' target‐locked event‐related potential (ERP) responses and we used cortical source analysis to explore which brain regions gave rise to the ERP responses. The P1 component and saccade latencies toward the peripheral target were modulated by the congruency between the walking direction of the cue and the position of the target. Infants' saccade latencies were faster in response to targets appearing at congruent spatial locations. The P1 component was larger in response to congruent than to incongruent targets and a similar congruency effect was found with cortical source analysis in the parahippocampal gyrus and the anterior fusiform gyrus. Overall, these findings suggest that a type of biological motion like the one of a vertebrate walking on the legs can trigger covert orienting of attention in 6‐month‐old infants, enabling enhancement of neural activity related to visual processing of potentially relevant information as well as a facilitation of oculomotor responses to stimuli appearing at the attended location.  相似文献   
237.
Older adults perform worse than younger adults when applying decision rules to choose between options that vary along multiple attributes. Although previous studies have shown that general fluid cognitive abilities contribute to the accurate application of decision rules, relatively little is known about which specific cognitive abilities play the most important role. We examined the independent roles of working memory, verbal fluency, semantic knowledge, and components of executive functioning. We found that age-related decline in applying decision rules was statistically mediated by age-related decline in working memory and verbal fluency. Our results have implications for theories of aging and decision-making.  相似文献   
238.
The study aimed to design and evaluate a program for the prevention of childhood depression (“Pozik-Bizi” [in English, “Live-Happily”]), comparing its effects with a socio-emotional intervention program based on cooperative play. The sample comprised 420 students aged 7 to 10?years from the Basque Country, 51.9% were randomly assigned to the experimental condition (“Pozik-Bizi”) program and 48.1% to the control group (“Play program”). Using a pretest-posttest repeated measures experimental design, 7 evaluation instruments were administered. When comparing the two interventions, it was confirmed that those who participated in the “Pozik-Bizi” program significantly decreased their level of clinical maladjustment, school maladjustment, emotional, and behavioral problems, and they increased positive behaviors that inhibit depression. However, the cooperative play program improved self-concept and social skills significantly more than the “Pozik-Bizi” program. The effect size in all the variables was small. The discussion analyzes the effectiveness of specific programs of prevention of childhood depression versus global programs of social-emotional development. This work provides a program to prevent childhood depression that has been shown to be effective in the reduction of clinical variables. In addition, this study confirms the positive potential of programs of cooperative play, to increase self-concept and social skills.  相似文献   
239.
Using focus groups, we examined support and opposition for Donald Trump prior to the 2016 presidential election. When ingroup members participate in discussion, this conversation alone typically strengthens and intensifies members’ initial attitudes. We used a pre‐ to post‐focus‐group questionnaire to assess attitudes toward Trump, his campaign, and policies. We argue that group polarization influenced people’s opinions about Trump such that attitudes became more extreme after discussion with like‐minded individuals. We report changes for Trump nonsupporters for which group polarization occurred on attitudes toward illegal immigration, political correctness, the military, women, and veterans after the group discussion. For each, level of support for Trump’s views decreased. To further explore potential psychological mechanisms associated with group polarization, we employed network science methods to examine the structure of the language associated with these issues and identify potential drivers of attitude change. Results provide some support for a common mechanism for group polarization, which may be driven by language dynamics specific to individual attitudes.  相似文献   
240.
Lesbian, gay, bisexual, transgender, queer, and gender non‐conforming (LGBTQ & GNC) youth experience more economic hardship and social stress than their heterosexual and cisgender peers. However, the ways that LGBTQ & GNC youth resist these damaging social factors and the corresponding implications for their health have not been addressed. Data were analyzed from a national participatory survey of LGBTQ & GNC youth ages 14–24 (= 5,860) living in the United States. Structural equation models indicated that economic precarity was associated with experiences of health problems. This association was mediated by the negative influence of minority stress on health as well as by activism, which had a positive association with health. Findings suggest that minority stress explanations of health inequalities among LGBTQ & GNC youth can benefit from including a focus on economic precarity; both in terms of its deleterious impact on health and its potential to provoke resistance to structural oppression in the form of activism.  相似文献   
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