A phase-field model for deformation twinning

We propose a phase-field model for modeling microstructure evolution during deformation twinning. The order parameters are proportional to the shear strains defined in terms of twin plane orientations and twinning directions. Using a face-centered cubic Al as an example, the deformation energy as a function of shear strain is obtained using first-principle calculations. The gradient energy coefficients are fitted to the twin boundary energies along the twinning planes and to the dislocation core energies along the directions that are perpendicular to the twinning planes. The elastic strain energy of a twinned structure is included using the Khachaturyan's elastic theory. We simulated the twinning process and microstructure evolution under a number of fixed deformations and predicted the twinning plane orientations and microstructures.     

Inhibition: Mental Control Process or Mental Resource?

The current study tested 2 models of inhibition in 45 children with language impairment and 45 children with normally developing language; children were aged 7 to 12 years. Of interest was whether a model of inhibition as a mental-control process (i.e., executive function) or as a mental resource would more accurately reflect the relations among mental-attentional (M) capacity, inhibition, updating, shifting, and language competence. Children completed measures of M-capacity (in the verbal and nonverbal domains), inhibition, updating, shifting, and language. Path analyses showed the data provided a poor fit to the model of inhibition as a mental-control process but a good fit to the model of inhibition as a mental resource. Results are consistent with the theory of constructive operators and suggest inhibition is a mental resource rather than a mental-control process.     

A neural autopilot theory of habit: Evidence from consumer purchases and social media use

This article applies a two-process “neural autopilot” model to field data. The autopilot model hypothesizes that habitual choice occurs when the reward from a behavior has low numerical “doubt” (i.e., reward prediction errors are small). The model toggles between repeating a previous choice (habit) when doubt is low and making a goal-directed choice when doubt is high. The model has ingredients established in animal learning and cognitive neuroscience and is simple enough to make nonobvious predictions. In two empirical applications, we fit the model to field data on purchases of canned tuna and posting on the Chinese social media site Weibo. This style of modeling is called “structural” because there is a theoretical model of how different variables influence choices by agents (the “structure”), which tightly restricts how hidden variables lead to observed choices. There is empirical support for the model, more strongly for tuna purchases than for Weibo posting, relative to a baseline “reduced-form” model in which current choices are correlated with past choices without a mechanistic (structural) explanation. An interesting set of predictions can also be derived about how consumers react to different kinds of changes in prices and qualities of goods (this is called “counterfactual analysis”).     

汉字形码和音码的整体性对部件识别的影响

本实验从分析汉字整体知觉的具体表现形式入手,通过三个实验探讨字的整体知觉对部件知觉的影响。实验一以分解方式为变量,考查字形整体知觉对部件识别的影响,发现识别不同结构的字的部件之活动受知觉分解路线(如顺读或逆读)的影响。作者认为这种分解方式效应很可能跟部位有关。实验二证实了这一分析,并进而认为部位效应又跟部位与字形整体知觉的紧密程度有关。实验三以语音码为变量,发现成字部件的字音与整体字语音一致者(形声字),其分解知觉成绩比不一致者(非形声字)有明显的优势。这意味着,整体字音知觉的单一性对部件知觉的作用。最后,本研究还考查了部件识别法的有效性,并认为在研究知觉的整体与部分关系问题时,该法不失为一种新的实验范型。     

幼儿在集合比较中运用数数的实验研究

本研究中运用了两个实验探讨数数干预和测查条件对儿童在集合比较中运用数数的影响。干预对3岁儿童(M=3：9)没有影响。在平均年龄为4岁4个月时．干预组儿童比控制组儿童更倾向于用数数比较集合．自然组儿童也比传统组更倾向于用数数。许多4岁儿童在无干预时不用数数可能是因为,1)不知数数比视觉性比较更有效,或2)他们在集合比较中的数数极易受测查情景因素的影响。儿童在集合比较中的数数运用与他们的数数水平密切关联。     

元认知与学习动机关系的研究

对于元认知与学习动机之间的关系,已有研究采用相关分析、回归分析的方法进行了初步探讨,但无论是相关还是回归都不能使我们清楚地了解两者之间的相互作用。本研究的目的即是运用路径分析的方法对这一问题进行较为深入的探讨。路径分析表明,动机变量对元认知活动具有“供能”的作用;动机变量对元认知的影响有的是直接发生的,如考试焦虑、目标定向,有的则是以其它变量为中介而间接发生的,如动机强度、学业自我概念。     

我国中学生的一般能力因素结构探讨

该研究在对一般能力倾向测验的因素分析基础上,提出了三因素能力结构模型,揭示了中国中学生有一般能力包括。数理能力,知觉能力,心理运动能力三个因素,共８种性向。     

重点中学与普通中学学生非智力因素的比较研究

本研究分别对重点中学与普通中学初一、初三年级学生的非智力因素状况进行调查,结果表明初一年级学生的非智力因素水平在两类学校之间不存在差异,而初三年级学生的非智力因素水平在两类学校之间存在着显著性差异（Ｐ＜０．０５）。随着年龄的增长,重点中学与普通中学学生的非智力因素水平都有所发展,但重点中学的学生发展得更好。本研究表明学校的教育环境影响着学生非智力因素的发展。     

Teaching a complex verbal response to a hearing-impaired girl

A 3-yr-old hearing-impaired girl, who used neither the article "the" nor the auxiliary verb "is" was taught to use these words in describing a picture, initially through imitation and then in response to the command, "Tell me about this". As a result, she was able to use sentences in the present progressive form to describe a number of pictures on which she had received no training. This newly acquired behavior was subsequently extinguished and then reinstated.