Facebook网络巡警

一个阳光正午,就快到午饭时间,在位于加州帕洛阿尔托的Facebook公司总部内,西蒙·阿克顿正在寻找色情图片。一对年轻人热恋缠绵的照片映人屏幕。这张图片赋予挑逗性,但是并不违规,阿克顿一边点击键盘,一边评判图片是否合适。下一幅图片：一个只穿着短内裤的年轻女子,用手遮着胸部。     

Social Perception in Infancy: A Near Infrared Spectroscopy Study

The capacity to engage and communicate in a social world is one of the defining characteristics of the human species. While the network of regions that compose the social brain have been the subject of extensive research in adults, there are limited techniques available for monitoring young infants. This study used near infrared spectroscopy to investigate functional activation in the social brain network of 36 five-month-old infants. We measured the hemodynamic responses to visually presented stimuli in the temporal lobes. A significant increase in oxyhemoglobin was localized to 2 posterior temporal sites bilaterally, indicating that these areas are involved in the social brain network in young infants.     

城市·身体·雕塑·行为艺术

2009年10月,英国伦敦人流穿梭的街道上,一群身着彩色帽T的家伙东奔西跑,他们像淘气的孩子般爬上爬下,把自己的身体挤进通道入口、壁凹和任何能找得到的公共建筑的缝隙内。街上的行人常常被他们的举动搞得一头雾水,目瞪口呆。     

Objective and subjective assessment of reciprocal peer teaching in medical gross anatomy laboratory

Reciprocal peer teaching (RPT), wherein students alternate roles as teacher and learner, has been applied in several educational arenas with varying success. Here, we describe the implementation of a reciprocal peer teaching protocol in a human gross anatomy laboratory curriculum. We compared the outcomes of the RPT class with those of previous classes in which RPT was not employed. Objective data (i.e., course grades) show no significant differences in gross anatomy laboratory grades between students in the RPT and non‐RPT classes. To subjectively evaluate the relative success of RPT in the laboratory, we analyzed student opinions obtained through anonymous surveys. These data show that a powerful majority of student respondents felt that RPT was beneficial and should be used in future classes. The greatest disadvantage was unreliable quality of teaching from peers; however, most students still felt that RPT should be continued. Students who felt that they had insufficient hands‐on experience (by virtue of dissecting only half the time) were significantly more likely to recommend abandoning RPT. These results underscore the importance of active student dissection, and suggest that a modified version of the described RPT protocol may satisfy more of the needs of large, diverse student populations. Several hidden benefits of RPT exist for faculty, administration, and students, including reduced need for large numbers of cadavers, attendant reduction in operating costs, and smaller student‐to‐teacher ratios. Anat Sci Educ 2:143–149, 2009. © 2009 American Association of Anatomists.     

The effects of opposition and gender on knee kinematics and ground reaction force during landing from volleyball block jumps

The aim of this study was to examine the effect of opposition and gender on knee kinematics and ground reaction force during landing from a volleyball block jump. Six female and six male university volleyball players performed two landing tasks: (a) an unopposed and (b) an opposed volleyball block jump and landing. A 12-camera motion analysis system (120 Hz) was used to record knee kinematics, and a force platform (600 Hz) was used to record ground reaction force during landing. The results showed a significant effect for level of opposition in peak normalized ground reaction force (p = .04), knee flexion at ground contact (p = .003), maximum knee flexion (p = .001), and knee flexion range of motion (p = .003). There was a significant effect for gender in maximum knee flexion (p = .01), knee flexion range of motion (p = .001), maximum knee valgus angle (p = .001), and knee valgus range of motion (p = .001). The changes in landing biomechanics as a result of opposition suggest future research on landing mechanics should examine opposed exercises, because opposition may significantly alter neuromuscular responses.     

Irrelevant information: Some effects on children's problem-solving

Children of 3, 5, 7, 9, and 11 years of age were given simple, social-matching problems. Two conditions were employed: each involved verbal presentation but in one (Condition V) no concrete representation was involved while in the other (Condition M) models were also used. Within each condition, information was provided which was (a) sufficient, (b) superfluous, (c) irrelevant or which displayed a combination of these characteristics. For all age groups, the problems containing only irrelevant information were the most difficult, although Condition M enhanced the performance of younger children while depressing that of 7- and 9-year-olds. The results were interpreted as supporting the view that a major source of difficulty for the child may lie in selecting the appropriate referent. Some inferences are drawn regarding the abilities of children to cope with ambiguity.