Development of the ability to distinguish communicative intention and literal message meaning

Children's ability to distinguish the literal meaning of a message and the speaker's communicative intent was investigated in 2 experiments. First- and second-grade children evaluated brief referential communication messages for ambiguity under 2 conditions. In an informed condition, the children knew which referent the speaker had intended. In an uninformed condition, they did not know the intended referent. 2 communication systems were used. In Experiment 1, the messages were written on cards and read to the child; in Experiment 2, a novel communication system was used. The developmental pattern of results was similar for both studies. The results showed that the first graders in the informed condition often claimed that an ambiguous message could not refer to a referent the speaker had not meant, whereas children in the uninformed condition were able to detect the referential ambiguity of the message. There were no condition differences for the second graders. The results suggest that young children's ability to analyze the literal meaning of a message is affected by the accessibility of the speaker's communicative intent and that children may develop a general ability to analyze representations of communicative intention.     

基于混合模式的广播电视大学教务管理系统的构建

远程开放教育在教育理念与管理手段上与普通高等教育都有着很大的差别,本文从远程开放教育学习的需求和广播电视大学系统自身特点进行分析,对广播电视大学开放教育的教务管理系统给出了一种基于B/S与C/S混合模式下分级分布式架构体系的解决方案。     

Creating change agents for interprofessional education and practice: a leadership programme for academic staff and health practitioners

Universities face increasing pressure not only to embed interprofessional education within health education curricula but also to prepare graduates as catalysts of change for interprofessional, team-based approaches to health care delivery. Currently, few leadership programmes exist that support the expansion of interprofessional education. This paper describes the development, implementation and evaluation of a leadership programme aimed to build faculty and health practitioners’ capacity to become change agents for interprofessional education and practice. The programme was delivered by two Australian universities, each in partnership with a local health care provider. A mixed method approach was adopted to measure participants’ pre- and post- knowledge, reactions to the programme, planned and reported behavioural changes, and organizational outcomes. The programme was positively evaluated and reported to increase participants’ understanding of interprofessional education and practice. Follow up with participants suggested the programme had facilitated the implementation of interprofessional education and practice in both academic and practice contexts.     

Development of knowledge about the appearance-reality distinction

7 studies of the acquisition of knowledge about the appearance-reality distinction suggest the following course of development. Many 3-year-olds seem to possess little or no understanding of the distinction. They fail the simplest Appearance-Reality (AR) tasks and are unresponsive to efforts to teach them the distinction. Skill in solving simple AR tasks is highly correlated with skill in solving simple perceptual Perspective-taking (PT) tasks; this suggests the hypothesis that the ability to represent the selfsame stimulus in two different, seemingly incompatible ways may underlie both skills. Children of 6-7 years have acquired both skills but nevertheless find it very difficult to reflect on and talk about such appearance-reality concepts as "looks like," "really and truly," and "looks different from the way it really and truly is." In contrast, children of 11-12 years, and to an even greater degree college students, possess a substantial body of rich, readily accessible, and explicit knowledge in this area.     

The Development of Children's Knowledge about Inner Speech

Two studies demonstrated that preschool children have little knowledge and awareness of inner speech. Study 1 showed that, in contrast to 6-to7-year-olds and adults, 4-year-olds usually did not infer that a person silently engaged in such intrinsically verbal mental activities as reading, counting, or recalling items from a shopping list was saying things to herself. They also tended to deny that covert speech is a possible human activity. Study 2 demonstrated that 4-and 5 year-olds are much poorer than adults at detecting their own inner speech. Children seem to acquire this sort of knowledge and awareness during the early school years, perhaps through experiencing their own inner speech while reading, writing, adding, and subtracting.     

Young Children's Understanding of "Remember" and "Forget"

3 studies examined young children's understanding that if one "remembers" or "forgot," one must have known at a prior time. In Study 1,4-year-olds but not 3-year-olds understood the prior knowledge component of "forgot"; both groups understood that a character with prior knowledge was "gonna remember." Study 2 controlled for the possibility that good performance on "remember" might be due to a simple association of remembering with knowledge. A significant number of 4-year-olds but not 3-year-olds understood that when 2 characters currently knew, the one with prior knowledge remembered, and that when neither character currently knew, the one with prior knowledge forgot. Study 3 made prior knowledge more salient by making the remembered or forgotten item visible to the subjects throughout. 4-year-olds performed near ceiling on both verbs, whereas 3-year-olds' performance did not differ from chance. The results are discussed in relation to children's developing understanding of the mind.     

Young Children''s Understanding of Fact Beliefs versus Value Beliefs

Recent research on the development of children's knowledge about the mind has shown that young 3-year-olds have difficulty inferring that another person holds a false belief about a matter of verifiable fact, even when provided with considerable help. 4 studies tested the hypothesis that they would have less difficulty inferring that another person holds an odd, nonnormative belief about a matter of taste or value--one which, like the false fact belief, they themselves do not hold. On fact-belief tasks, an experimenter acted as if, or even explicitly stated that, she believed that the contents of a container were other than what the children knew to be the case. On value-belief tasks, she behaved as if she believed that a stimulus had a good or bad taste, smell, or appearance, whereas they thought it had the opposite. The results of all 4 studies confirmed the hypothesis.     

碘催化丙酮缩-1,2-丙二醇的合成

以单质碘为催化剂用于缩酮的合成。研究了催化剂用量、酮醇摩尔比及带水剂用量对反应产率的影响。当0．1mol丙酮与0．12mol 1,2-丙二醇的混合物在50mg碘催化下，以环已烷为带水剂，回流分水50min，产品收率可达49％。     

Young children's knowledge about visual perception: projective size and shape

Although recent research indicates that an increased sensitivity to visual appearances develops around 4 or 5 years of age, evidence from perceptual studies suggests that certain types of appearances, that is, projective size and shape, are not noticed or understood until at least 7. 4 experiments investigated preschool children's knowledge of the projective size--distance and projective shape--orientation relationships. In Experiment 1, 3- and 4-year-olds were asked whether an object should be moved farther or nearer in order to increase or decrease its apparent size. 4-year-olds performed significantly better than chance, but 3-year-olds did not. Experiment 2 showed that 3-year-olds are able to perceive projective size changes, indicating that although they do not fully understand the projective size-distance relationship, the necessary perceptual information is potentially available to them. In Experiment 3, 3- and 4-year-olds were asked to indicate how a circular object should be rotated to make it appear either circular or elliptical. Again, 4-year-olds performed significantly better than chance, but 3-year-olds did not. Again also, the results of Experiment 4 indicate that although 3-year-olds are not aware of the projective shape-orientation relationship, they are capable of attending to changes in projective shape. Thus, the constraints on children's knowledge of the projective size-distance and projective shape-orientation relationships seem to be at least partly cognitive rather than wholly perceptual. These results are interpreted as further evidence for the acquisition of level 2 percept knowledge during early childhood.