The effect of persistent posttraumatic stress disorder symptoms on executive functions in preadolescent children witnessing a single incident of death

We compared executive functions (EFs) of traumatized preadolescent children with and without marked posttraumatic stress disorder (PTSD) symptoms to the performance of a nontraumatized control group, and examined the relationships between EF deficits and functional status in traumatized preadolescent children. Fifty-one preadolescent children who had witnessed a death at school 30 months prior (26 with marked PTSD symptoms and 25 without) and 30 healthy controls who had not been traumatized participated. EFs were examined using the Comprehensive Attention Test (CAT). The functional state of traumatized children was measured by the Parent Report Form-Children's Health and Illness Profile-Children's Edition (PRF-CHIP-CE). The traumatized children, regardless of status of PTSD symptomatology, showed poorer working memory performance than nontraumatized healthy controls. The traumatized children with marked PTSD symptoms performed more poorly on measures of interference control compared to those children without marked PTSD symptoms. Lower levels of EFs were associated with lower risk avoidance and diminished academic achievement in traumatized children. These results indicate that an inhibitory control deficit is specifically associated with the current PTSD symptoms but not with trauma exposure per se.     

依恋表征的意识和无意识性初探

采用关系等级问卷、亲密关系经历问卷和内隐联想测验(IAT)分别作为研究依恋表征的外显和内隐的测量工具,以103名处于恋爱关系中的大学生和研究生为被试,探讨一般依恋表征和特殊依恋表征的意识性与无意识性以及它们的一致性。结果发现:(1)一般依恋表征和特殊依恋表征中,安全型和恐惧型的个体在无意识层面上的反应时表现与外显理论相符,过度投入型的被试意识和无意识的表现不一致;(2)个体在无意识水平上对目标人物积极评价的差异与个体在意识水平上的依恋状况(一般依恋关系和婚恋关系)有关。(3)一般依恋表征中过度投入型和冷漠型被试,内隐联想测验和外显依恋量表结果一致的占33%;特殊依恋表征中过度投入型和冷漠型被试,内隐联想测验和外显依恋量表结果一致的占37%。     

Interplay between acoustic/phonetic and semantic processes during spoken sentence comprehension: an ERP study

When listening to speech in everyday-life situations, our cognitive system must often cope with signal instabilities such as sudden breaks, mispronunciations, interfering noises or reverberations potentially causing disruptions at the acoustic/phonetic interface and preventing efficient lexical access and semantic integration. The physiological mechanisms allowing listeners to react instantaneously to such fast and unexpected perturbations in order to maintain intelligibility of the delivered message are still partly unknown. The present electroencephalography (EEG) study aimed at investigating the cortical responses to real-time detection of a sudden acoustic/phonetic change occurring in connected speech and how these mechanisms interfere with semantic integration. Participants listened to sentences in which final words could contain signal reversals along the temporal dimension (time-reversed speech) of varying durations and could have either a low- or high-cloze probability within sentence context. Results revealed that early detection of the acoustic/phonetic change elicited a fronto-central negativity shortly after the onset of the manipulation that matched the spatio-temporal features of the Mismatch Negativity (MMN) recorded in the same participants during an oddball paradigm. Time reversal also affected late event-related potentials (ERPs) reflecting semantic expectancies (N400) differently when words were predictable or not from the sentence context. These findings are discussed in the context of brain signatures to transient acoustic/phonetic variations in speech. They contribute to a better understanding of natural speech comprehension as they show that acoustic/phonetic information and semantic knowledge strongly interact under adverse conditions.     

Hemispheric asymmetry in the efficiency of attentional networks

Despite the fact that hemispheric asymmetry of attention has been widely studied, a clear picture of this complex phenomenon is still lacking. The aim of the present study was to provide an efficient and reliable measurement of potential hemispheric asymmetries of three attentional networks, i.e. alerting, orienting and executive attention. Participants (N=125) were tested with the Lateralized Attention Network Test (LANT) that allowed us to investigate the efficiency of the networks in both visual fields (VF). We found a LVF advantage when a target occurred in an unattended location, which seems to reflect right hemisphere superiority in control of the reorienting of attention. Furthermore, a LVF advantage in conflict resolution was observed, which may indicate hemispheric asymmetry of the executive network. No VF effect for alerting was found. The results, consistent with the common notion of general right hemisphere dominance for attention, provide a more detailed account of hemispheric asymmetries of the attentional networks than previous studies using the LANT task.     

Discrepancies Between Implicit and Explicit Self‐concepts of Intelligence Predict Performance on Tests of Intelligence

Three studies investigated the correspondence between implicit and explicit self‐concepts of intelligence and how that correspondence is related to performance on different intelligence tests. Configurations of these two self‐concepts were found to be consistently related to performance on intelligence tests in all three studies. For individuals who self‐reported high intelligence (high explicit self‐concept), a negative implicit self‐concept (measured with the Implicit Association Test) led to a decrease in performance on intelligence tests. For participants whose self‐report indicated a low self‐concept of intelligence, positive automatic associations between the self and intelligence had a similar effect. In line with a stress hypothesis, the results indicate that any discrepant configuration of self‐concepts will impair performance. Importantly, the prediction of performance on intelligence tests by the self‐concept of intelligence was shown to be independent of self‐esteem (Study 3). Copyright © 2011 John Wiley & Sons, Ltd.     

生物反馈疗法对大学生考试焦虑的治疗作用

探讨生物反馈疗法对大学生考试焦虑的治疗作用。在某大学随机抽取学生1500名,采用考试焦虑量表进行筛查,选取焦虑组和对照组各30名。利用生物反馈疗法进行干预,采用脑电α波相对功率、肌电和皮电导联进行检测,每周2次,持续4周。结果表明：1.经过4周的干预,焦虑组干预前后各生理指标存在差异;2.生物反馈疗法干预考试焦虑在疗效上存在性别差异。结论：生物反馈疗法能有效降低大学生考试焦虑水平,对其治疗取得良好的效果。     

排除“每个人都优于平均水平”机制影响的自我提升研究

采用优于平均效应、自我服务归因偏向和内隐测验三种方法测量中国大学生的自我提升,并在前两种方法中考虑了EBTA机制的影响,以探讨中国人的自我提升动机及其表现形式。结果发现：EBTA机制影响显著;排除EBTA机制的影响后,大学生依然存在优于平均效应和自我服务归因偏向;大学生存在内隐自我提升值;内隐自我提升值与外显自我提升值之间存在显著正相关。     

Effect of tDCS on Fine Motor Control of Patients in Subacute and Chronic Post-Stroke Stages

Abstract

In this study we compared the effects of transcranial direct current stimulation (tDCS) in the subacute and chronic stages of post-stroke recovery. Anodal/sham tDCS was applied to the primary motor cortex of stroke patients in these stages of recovery in a cross-over design. The Jebsen–Taylor hand function test was employed. The repeated-measure ANOVA showed significant influence of the stimulation type and test performance time (during/after tDCS) with no overall influence of recovery stage. The interaction TYPE*TIME*STAGE was significant. The effect after anodal tDCS in the subacute stage was significantly higher compared to the effects in all relevant conditions including the chronic stage. Therefore, tDCS treatment in the subacute stage of recovery can be superior, at least for some patients, to treatment in the chronic stage.     

大学生决策的内隐偏向研究

分别运用外显的描述性范式和内隐联结测验两种方法对决策的比率偏好及其特性进行了考察,结果表明:(1)外显决策受到效价类型的影响,负效价情景下的比率偏好现象明显降低;(2)被试存在内隐比率偏好效应,这种偏好影响着被试对决策的认知和解释,具有一定的稳定性;(3)运用内隐联结测验来测量内隐比率偏好是有效、敏感的。(4)外显比率偏好与内隐比率偏好涉及决策的不同结构。