Manipulation of logical structure of chemistry problems and its effect on student performance

It has been shown previously that manipulation of the M demand (amount of information needed for processing) of chemistry problems affects student performance, which suggests that manipulation of logical structure of chemistry problems could also lead to significant changes in performance. The objective of this study is to investigate the following: Given the opportunity for training, what is the effect of increasing (manipulation) the complexity of logical structure of chemistry problems on student performance, and to what extent can cognitive variables explain changes in performance. Results obtained show that (a) even a small increase in the logical structure of a problem can change the role of cognitive variables (mental capacity and formal reasoning) to the extent that increase in logical complexity outweighs the advantage students may have gained through training on a similar problem; (b) the use of algorithms and training on particular types of chemistry problems could lead to a situation in which formal reasoning is the only cognitive variable that explains variance in performance significantly; and (c) after having solved very similar problems on two different occasions with improving performance, the improvement is not retained if the logical structure of a third problem increases considerably. It is concluded that when dealing with significant changes in logical complexity of chemistry problems, developmental level of students is the most consistent predictor of success. A model for the qualitative analysis of logical complexity of chemistry problems is presented.     

Simplifying Algebraic Expressions: Teacher Awareness and Teaching Approaches

This study investigates four seventh-grade teachers' awareness of students' tendency to conjoin or 'finish' open expressions. It also investigates teachers' ways of coping with this tendency. Three types of data were collected: 1) lesson plans, 2) lesson observations, and 3) post-lesson interviews. The analysis showed that the two experienced teachers were aware of this tendency and some of its possible sources, while the novices were unaware of either. Teaching approaches related to this tendency also differed considerably. In conclusion we analyze these teaching methods in light of the existing literature and discuss possible short- and long-term implications of the use of each approach.     

The relationship between syntactic awareness and reading performance

This study was designed to examine the relationship between syntactic awareness and reading performance. A major concern was to provide an estimate of the effect of syntactic training that was not confounded with training that focused on semantic features of words. The training exercises used in the study focused on all levels of syntactic awareness in order that the effect of such training could be assessed on students’ performance on tasks that tapped each of the levels. Results of this study showed that syntactic awareness could be improved through training. The effect was stable, being apparent at the two post-test times. However, no evidence was found for a systematic effect of improved syntactic awareness on reading ability. Moreover, syntactic training did not show any greater effect than no treatment or semantic training on children’s grammatic comprehension, their ability to use fix-up strategies, or on their general reading ability score. Training had a different impact on the accuracy of oral reading for the syntactic and semantic training groups. Thus, in terms of the developmental sequence of syntactic awareness proposed by Gombert (1992), children trained in the cloze procedure improved at the two highest levels, whilst showing neither a corresponding change in the lower levels of awareness, nor improved functional reading performance.     

期待与认同：残疾人奥林匹克运动的心理健康教育价值

残疾人身心的差异和来自社会的歧视对残疾人心理健康有着深刻的消极影响.残疾人常常表现出低自我认知、低自我效能、低自我赋权以及这些心理问题导致的消极情绪.而残疾人奥林匹克运动员在心理健康状态和情绪指数方面比不参加体育运动的残疾人表现的更为积极.残疾人奥林匹克运动员在残疾人奥林匹克教育价值实现过程中,不仅是受教育者,而且通过其自身的竞技和专门的讲演也对其他残疾人和正常人心理健康状态和情绪产生着积极的影响.     

Preservice and inservice teachers’ perceptions of appropriateness of teacher self-disclosure

This study investigated preservice and inservice teachers' perceptions of appropriateness of teacher self-disclosure. A sample of 180 preservice teachers and 135 preK-12 teachers participated in the study. Results showed statistically significant differences between the groups of teachers in their perceptions of appropriateness of teacher self-disclosure in the three dimensions: Uncommon Topics, Uncommon Purposes, and Consideration of Students. No significant differences were found in the two dimensions: Common Topics and Common Purposes. This study makes an excellent contribution to the theoretical framework of the study of teacher self-disclosure and also provides implications for teaching and teacher education.     

Children's Trust in Previously Inaccurate Informants Who Were Well or Poorly Informed: When Past Errors Can Be Excused

Past research demonstrates that children learn from a previously accurate speaker rather than from a previously inaccurate one. This study shows that children do not necessarily treat a previously inaccurate speaker as unreliable. Rather, they appropriately excuse past inaccuracy arising from the speaker's limited information access. Children ( N = 67) aged 3, 4, and 5 years aimed to identify a hidden toy in collaboration with a puppet as informant. When the puppet had previously been inaccurate despite having full information, children tended to ignore what they were told and guess for themselves: They treated the puppet as unreliable in the longer term. However, children more frequently believed a currently well-informed puppet whose past inaccuracies arose legitimately from inadequate information access.