Potential fluctuations in phase change memory materials

Long-range potential fluctuations have been quantified in amorphous and crystallised thin films of a family of Ge–Sb–Te (GST) chalcogenide glasses. Among the compositions studied, the width of the potential fluctuations is the smallest for amorphous Ge₂Sb₂Te₅. This is also the most robust material in terms of the number of write–erase cycles for GST films when used as phase change memory materials. A plausible explanation for this observation is given and a criterion for selecting suitable compositions in optical memory devices is proposed.     

患者致残后的心理变化与康复

探讨患者致残后复杂的心理变化一些常见因素,然后根据各种因素制定治疗方案。对所治疗残疾人为研究对象,通过与残疾人交谈,观察其言行变化,问卷调查,随访调查,将获得的资料进行分析整理,得出患者各种复杂心理变化的病因。患者由正常人变为残疾人这个复杂心理变化由自身的应激、自我认识及社会文化等各种因素所引起,根据各种因素制定一些有...     

Sensitivity to spacing changes in faces and nonface objects in preschool-aged children and adults

Sensitivity to variations in the spacing of features in faces and a class of nonface objects (i.e., frontal images of cars) was tested in 3- and 4-year-old children and adults using a delayed or simultaneous two-alternative forced choice matching-to-sample task. In the adults, detection of spacing information was robust against exemplar differences for faces but varied across exemplars for cars (Experiment 1A). The 4-year-olds performed above chance in both face and car discrimination even when differences in spacing were very small (within ±1.6 standard deviations [SDs]) and the task involved memory components (Experiment 1B), and the same was true for the 3-year-olds when tested with larger spacing changes (within ±2.5 SDs) in a task that posed no memory demands (Experiment 2). An advantage in the discrimination of faces over cars was found at 4 years of age, but only when spacing cues were made more readily available (within ±2.5 SDs). Results demonstrate that the ability to discriminate objects based on feature spacing (i.e., sensitivity to second-order information) is present at 3 years of age and becomes more pronounced for faces than cars by 4 years of age.     

Development of sensitivity to spacing versus feature changes in pictures of houses: Evidence for slow development of a general spacing detection mechanism?

Adults are expert at recognizing faces, in part because of exquisite sensitivity to the spacing of facial features. Children are poorer than adults at recognizing facial identity and less sensitive to spacing differences. Here we examined the specificity of the immaturity by comparing the ability of 8-year-olds, 14-year-olds, and adults to discriminate houses differing in the spacing between features versus those differing in the shape of the features themselves. By 8 years of age, children were more accurate for discriminations involving the feature set compared with the spacing set, and the difference in accuracy compared with adults was greater for the spacing set than for the feature set. Importantly, when sets were matched in difficulty for adults, this greater immaturity on the spacing set than on the feature set remained. The results suggest that, at least by age 8, immaturities in sensitivity to the spacing of features may be related to immaturities in general perceptual mechanisms rather than face-specific mechanisms.     

阅读知觉广度眼动研究述评

文章述评了测量阅读知觉广度的实验范式,并对阅读知觉广度的研究成果以及影响阅读知觉广度大小的因素进行小结,最后对国内研究阅读知觉广度需要注意的问题进行了讨论。     

Conventional displays: Evidence for socially mediated costs of threat displays in a lizard

Threat displays are used to settle the vast majority of contests between green anoles (Anolis carolinensis). While these displays have been the subject of a number of studies, very little is understood about the information they convey. Theoretical models divide displays into several types of signals, based on the mechanism that stabilizes their use: 1) performance signals, 2) handicapping signals, or 3) conventional displays. The existence of performance displays has excellent empirical support, as do models of their use. Handicapped signalling models, especially those relating to mate‐choice, have been highly influential, though little evidence suggests that threat displays are, in fact, handicapping. Most threat displays appear to be conventional, but little empirical work documents conventional signalling systems. This study investigated the use of headbob, pushup, and lateral compression displays, and concluded that headbob cadence, a discrete signal with three alternative rhythms, is a conventional display indicating impending escalation. Pushups and lateral compression displays appear not to be handicaps, since neither indicates impending escalation, and they do not correlate with fighting ability or condition. Aggr. Behav. 30:326–341, 2004. © 2004 Wiley‐Liss, Inc.     

Primary school teachers’ perceptions of school children coping with changing family situations – a hybrid Hong Kong experience

The personal beliefs of teachers and the cultural traditions of society can have significant effects on the adjustment of children in changing family situations. This paper explores primary school teachers’ perception of children coping with difficult family situations and family changes in the hybrid context of Hong Kong, where Westernization meets with Chinese culture. A qualitative case study methodology was used. Thirty one teachers of different ages, experience, and roles at school were interviewed. The finding shows that teachers were on the whole quite traditional in their perception of children in difficult family situations despite the co-existence of modern ideas of marriage with traditional family values. Implications of the study for teacher education are discussed.     

Is Disgust a Homogeneous Emotion?

Many theoretical accounts consider disgust to be a unitary emotion, although others have challenged this notion. We predict that if core disgust and socio-moral disgust are different constructs, then their co-associated elicited emotions are likely to be different, and time as well as gender are likely to differentially affect their intensity (via a greater reliance of socio-moral disgust on cognitive appraisal). To test these predictions, participants were shown photographs of core and socio-moral disgust elicitors and asked to provide a wide ranging rating of their emotional response to each at 3 time points. Each elicitor generated a significantly different emotional response. Furthermore, the disgust response to core elicitors weakened over time whereas socio-moral responses intensified. Males and females showed similar levels of disgust to socio-moral elicitors, but females showed higher levels to core elicitors. Overall, the results suggest that a different emotional construct was activated by each type of elicitor.     

Emotional display rules in Palestine: Ingroup/outgroup membership,status of interaction partner and gender

This study investigates emotional display rules within the Palestinian context, focusing on the seven basic emotions in a sample of 150 college students from the Gaza Strip and the West Bank. Overall, participants felt that it was more appropriate to express positive emotions (happiness and surprise) than negative powerful (anger, contempt and disgust) or negative powerless (fear and sadness) emotions. They also perceived it to be more appropriate to express positive and negative powerless emotions to ingroup than outgroup members and to express negative powerful emotions to lower status compared to higher status individuals. Gender differences were also found: men endorsed greater expression of both powerful and, surprisingly, powerless emotions than women, but only when interacting with outgroup members. Results are interpreted in terms of the cultural values of individualism–collectivism and power distance as well as cultural differences in emotional expressiveness between collectivistic societies. This study is one of the first to examine emotional display rules in an Arab population, thus expanding our current knowledge base.     

不同性质语篇背景信息的激活与抑制

运用窗口阅读及再认探测技术,探讨即时与延迟状态下合适与不合适背景信息的激活模式。被试阅读含有精细阐述错误信息的实验材料及不含错误信息的参照材料,并对合适或不合适(参照条件下为无关)的探测词进行再认反应。结果发现,合适与不合适信息激活关系随时程延长发生的逆转是由于合适信息激活水平得到提升、不合适信息受到抑制所导致。但即使在延迟状态下,不合适先行词的激活水平也并没有降到与一个无关信息等同的程度,表明受精细阐述的错误信息即使在经过更正之后,其在语篇表征中仍有着比较重要的地位。