3～5岁幼儿基于面孔的信任判断的发展

本研究通过两个实验探讨了262名3~5岁幼儿基于面孔的信任判断能力及其年龄间差异。结果发现:(1)实验1中,当陌生面孔单张呈现时,3岁幼儿还不能正确地区分被成人评价为可信和不可信的面孔,而4、5岁幼儿已经能够基于面孔特征做出与成人基本一致的信任判断;(2)实验2中,当配对呈现可信vs.不可信两张面孔时,3~5岁幼儿都能够在日常交往情境中依据陌生交往者的面孔特征做出与成人基本一致的信任判断,并且随着年龄的增长,信任判断准确率逐步提高。这些结果表明幼儿从3岁开始已经能够基于面孔做出信任判断,随着年龄的增长,信任判断能力逐步发展。     

Suicidal Ideation and Behavior in Adolescents Aged 12–16 Years: A 17‐Year Follow‐Up

The prevalence of suicidal ideation/behavior in 1983 or 1987 and its association with future mental health in 2001 were evaluated in a provincially representative sample of Canadian adolescents (n = 1,248) aged 12 to 16 years. Approximately 13.3% (95% CI = 11.5–15.3) of adolescents self‐reported suicidal ideation/behavior. Adolescent agreement with parent (κ = .07) and teacher (κ = .05) reports at baseline was low because adults identified so few subjects. In adulthood, the associations between adolescent self‐reports of suicidal behavior/ideation and major depression and other mental health indicators were explained by respondent sex and adolescent emotional problems reported in 1983/1987. Adolescents with suicidal behavior/ideation often are not recognized by their parents and teachers and may be at risk for persistent psychiatric problems attributable to coexisting mental health problems early‐on.     

A Trait‐Interpersonal Analysis of Suicide Proneness Among Lesbian,Gay, and Bisexual Community Members

Suicide remains a concerning issue for lesbian, gay, and bisexual (LGB) persons. The integrated effects of five‐factor model personality traits and interpersonal‐psychological theory of suicide (IPTS) constructs on suicide proneness in a community sample of 336 LGB adults were examined. Results supported a model inclusive of all five‐factor model domains predicting IPTS constructs leading to suicide proneness. Effects of neuroticism and extraversion were both mediated by perceived burdensomeness and thwarted belongingness. Thwarted belongingness mediated the effect of agreeableness on suicide proneness. Identified mediation pathways build on existing trait‐interpersonal theory and may inform clinical services for sexual minority persons.     

身体映像影响因素的生态系统分析

身体映像对个体的身心发展有重要的意义, 对它的研究在近20年来更是如火如荼地发展。根据布朗芬布伦纳的生态系统理论, 从微系统(父母、同伴、伴侣)、外系统(媒体)、宏系统(社会文化)以及处于系统中的个体因素四个方面, 对影响身体映像的因素进行初步的分类和归纳, 为身体映像的干预措施提供参考。     

I Can Stomach That! Fearlessness About Death Predicts Attenuated Facial Electromyography Activity in Response to Death‐Related Images

Objective measures of suicide risk can convey life‐saving information to clinicians, but few such measures exist. This study examined an objective measure of fearlessness about death (FAD), testing whether FAD relates to self‐reported and physiological aversion to death. Females (n = 87) reported FAD and disgust sensitivity, and facial electromyography was used to measure physiological facial responses consistent with disgust while viewing death‐related images. FAD predicted attenuated expression of physiological death aversion, even when controlling for self‐reported death‐related disgust sensitivity. Diminished physiological aversion to death‐related stimuli holds promise as an objective measure of FAD and suicide risk.     

Impact of Firearm Availability and Gun Regulation on State Suicide Rates

Past studies on suicide have investigated the association of firearm ownership and suicide risk in the United States. The aim of the present study was to build on previous work by examining the impact of firearm storage practices and the strictness of firearm regulation on suicide rates at the state level. Data were compiled from primarily three sources. Suicide and firearm ownership information was obtained from the Centers for Disease Control and Prevention. Strictness of handgun regulation was derived from figures available at the Law Center to Prevent Violence, and controls were taken from the US Bureau of the Census. Mixed models were fitted to the data. Household firearm ownership was strongly associated with both suicide by all mechanisms, and firearm suicide. Storage practices had especially elevated consequences on suicide rates. Percent with loaded guns and gun readiness increased suicide rates, and strictness of gun regulation reduced suicide rates. Ready access to firearms can make a difference between life and death. Loaded and unlocked firearms within reach become risk factors for fatal outcomes from suicidal behavior. Future research might want to examine ways of obtaining more recent data on individual firearm ownership. This study proposes several policy recommendations for suicide prevention.     

问题解决中策略的变化：一项微观发生研究

以30名小学三年级儿童为被试,以一种特殊的方程问题为材料,采用微观发生法,先后进行了5次测查,收集了解题后的口语报告资料,从策略变化的路线、速率、广度、来源以及变化模式的多样性等方面详细探讨了问题解决策略的变化过程。结果发现,在面临新的问题时,被试缺乏相应知识和专门的解题策略,这时以使用多种常规策略以及错误策略为主;此后,当被试建构起对问题的正确表征时,就以使用正确策略为主,甚至发现了非常有技巧性和领域专门性的快捷策略,这时策略的数量明显减少;在面临难度较大的迁移题目时,快捷策略的使用率又降低,而更多借助于常规策略。可见,策略的获得是一个由错误到正确、由多种尝试到选择其一、由一般到专门的演化过程,这主要是一个学生自主建构的过程,当然也受到正式和非正式教育提供的知识的影响。值得说明的是,快捷策略的获得受到问题呈现模式的影响。总是呈现相同题目的单一模式有助于快捷策略的发现,而在混合训练中,插入不同性质的题目会干扰快捷策略的发现;但是,当面临迁移问题时,单一训练相比于混合训练的优势会消失。此外,正确使用常规策略是发现快捷策略的前提。     

Information matrix estimation procedures for cognitive diagnostic models

Two new methods to estimate the asymptotic covariance matrix for marginal maximum likelihood estimation of cognitive diagnosis models (CDMs), the inverse of the observed information matrix and the sandwich-type estimator, are introduced. Unlike several previous covariance matrix estimators, the new methods take into account both the item and structural parameters. The relationships between the observed information matrix, the empirical cross-product information matrix, the sandwich-type covariance matrix and the two approaches proposed by de la Torre (2009, J. Educ. Behav. Stat., 34, 115) are discussed. Simulation results show that, for a correctly specified CDM and Q-matrix or with a slightly misspecified probability model, the observed information matrix and the sandwich-type covariance matrix exhibit good performance with respect to providing consistent standard errors of item parameter estimates. However, with substantial model misspecification only the sandwich-type covariance matrix exhibits robust performance.     

听觉预测编码：对声音重复和变化的神经反应

预测编码被认为是脑与复杂环境交互的重要机制之一, 有效感知外界环境并对未来事件做出预测, 对个体生存有着至关重要的意义。人类大脑会基于感觉输入以迭代的方式持续优化表征外部环境的内部模型, 并不断预测接下来的感觉输入。以听觉模态为例, 人类及动物对声音重复和听觉变化的神经反应(如失匹配负波和刺激特异性适应)是大脑预测编码的重要体现, 表现为重复抑制和预测误差。结合人类和动物模型在此理论框架下开展跨物种研究将有助于加深我们对听觉加工, 甚至是大脑工作机制的认识。