数字加工的认知神经基础

数学作为人类最重要的发明,越来越引起认知神经科学家的重视与关注,究竟什么才是人类数学知识的脑基础？脑成像的研究已经证实了一个参与数学运算加工的神经网络,包括顶叶皮质、侧前额叶皮质、内前额叶皮质、和小脑。实验证明：人脑对于数字具有一种模拟表达,类似于将数量在脑内部作为一种内心的数字线上的点来操作。神经心理学的研究证实数字加工的这种数量表达分布于两半球,其优势区位于下顶叶皮质区。     

Mother–Child Book‐Sharing and Children's Storytelling Skills in Ethnically Diverse,Low‐Income Families

The present study examined book‐sharing interactions between mothers and their 4‐year‐old children from African American (n = 62), Dominican (n = 67), Mexican (n = 59) and Chinese (n = 82) low‐income U.S. families, and children's independent storytelling skills one year later. Mothers' book‐sharing style was analysed in terms of how much storyline information they provided (story components), the extent to which they asked children about the story (dialogic emphasis) and which features of the story they highlighted (story content). African American mothers referred to more story components than did Dominican mothers, and Mexican mothers surpassed Dominican and Chinese mothers. Mothers of all groups were low in dialogic emphasis; they predominantly narrated rather than asked about the story, although Mexican mothers asked relatively more questions than did African American and Dominican mothers. In terms of content, compared with other groups, African American mothers were most likely to emphasize ‘individual goals’, and Chinese mothers were most likely to emphasize ‘negative consequences’. Latino mothers were more likely to emphasize ‘emotions’ than were Chinese mothers. Children's storytelling styles partially mirrored those seen in their mothers. Mothers' dialogic emphasis related to children's contributions to book‐sharing, which in turn predicted children's later independent storytelling skills. Copyright © 2014 John Wiley & Sons, Ltd.     

认知风格和信息呈现方式对学习者认知负荷的影响

该研究采用2×2的被试间实验设计,探讨了认知风格和信息呈现方式对认知负荷的影响。研究结果表明：信息呈现方式对学习时间有显著的影响;认知风格对学习者的认知负荷有显著的影响;认知风格和信息呈现方式无显著的交互作用;学习时间、心理努力量和材料难度具有一致性,但它们可能对不同的认知负荷敏感,即学习时间可能反映了总认知负荷量,心理努力量和材料难度可能分别对内在和有效认知负荷敏感。     

关于性别刻板印象的初步调查

性别刻板印象是一种重要的社会刻板印象。我们在 3 80名大学生中作了性别刻板印象的初步调查 ,并考察了性别和性别角色对性别刻板印象的影响。结果发现中国大学生的性别刻板印象与传统的性别观念比较一致 ,认为男性更坚强能干 ,女性更被动顺从 ,且这一印象不因性别和性别角色而改变。但男女被试的性别刻板印象仍存在明显差异。不同性别角色被试之间的性别刻板印象也有差异。总体而言 ,性别对性别刻板印象的影响比性别角色对性别刻板印象的影响大。     

范畴异同判断中大脑两半球功能不对称性的实验研究

本实验利用汉字单词和图片为刺激材料,要求被试判断同时呈现在左视野和中央视野或右视野与中央视野的二个刺激是否属同一范畴,对范畴异同判断中大脑两半球功能不对称性进行研究。实验结果表明:(1)对汉字单词的处理为大脑左半球占优势,对图片材料的处理为大脑右半球占优势;(2)判断方式(异判断和同判断)在左半球和右半球之间未显示出不对称性。     

Predicting risk decisions in a modified Balloon Analogue Risk Task: Conventional and single-trial ERP analyses

Event-related potential (ERP) has the potential to reveal the temporal neurophysiological dynamics of risk decision-making, but this potential has not been fully explored in previous studies. When predicting risk decision with ERPs, most studies focus on between-trial analysis that reflects feedback learning, while within-trial analysis that could directly link option assessment with behavioral output has been largely ignored. Suitable task design is crucial for applying within-trial prediction. In this study, we used a modified version of the classic Balloon Analogue Risk Task (BART). In each trial of the task, participants made multiple rounds of decisions between a risky option (pump up the balloon) and a safe option (cash out). Behavioral results show that as the level of economic risk increased, participants were less willing to make a risky decision and also needed a longer response time to do so. In general, the ERP results showed distinct characteristics compared with previous findings based on between-trial prediction, particularly about the role of the P1 component. Specifically, both the P1 (amplitude and latency) and P3 (amplitude) components evoked by current outcomes predicted subsequent decisions. We suggest that these findings indicate the importance of selective attention (indexed by the P1) and motivational functions (indexed by the P3), which may help clarify the cognitive mechanism of risk decision-making. The theoretical significance of these findings is discussed.     

长沙市大学生成就动机取向特点的研究

本研究从大学生学校类型、年级、性别三个维度,探讨长沙市大学生成就动机取向的特点。从湖南省长沙市三所大学中(湖南师范大学、湖南大学、中南大学)随机抽取300名大学生,每个学校各100名作为研究对象。研究结果表明:(1)长沙市大学生的个我取向成就动机明显高于社会取向成就动机;(2)长沙市不同学校类型的大学生成就动机取向无明显差异;(3)不同年级大学生的成就动机取向无明显差异;(4)长沙市大学生成就动机取向的性别差异显著。     

Body Image Victimization Experiences and Disordered Eating Behaviors among Chinese Female Adolescents: The Role of Body Dissatisfaction and Depression

Sex Roles - Body image victimization experiences that include appearance-based teasing, “fat talk,” and negative comments by parents and peers have been found to be associated with...     

Changes of hardness and electronic work function of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass on annealing

The hardness and electronic work function (EWF) of a bulk metallic glass, namely Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5, have been studied experimentally, with an emphasis on the effect of heat treatments. The glass was annealed at different time and temperatures, and its hardness and EWF measured using the Rockwell indentation technique and a scanning Kelvin probe system, respectively. It is found that the EWF decreases with annealing time and temperature, whereas the hardness increases. This study shows a close relationship between hardness and EWF, indicating that the EWF could be a sensitive parameter for characterising and investigating the mechanical behaviour of BMG at the electronic level.