Preference for fixed over variable access to food

Three pigeons pecked for food in a concurrent chain schedule. Pecks in one link of the concurrent chain resulted in a fixed duration of access to food, while pecks in the other link resulted in either no access to food or 8 sec of access to food. All three pigeons pecked more often in the initial link which resulted in the fixed duration of access to food, indicating preference for fixed over variable access to food. This result does not seem consistent with previous results showing preference for variable- over fixed-interval schedules. However, the results are consistent if preference is determined by differential weighting of reward values, and preference is independent of whether a reward is fixed or variable. This analysis suggests that previous results of fixed- vs. variable-reward studies cannot be used to argue that animals do not prefer information over uncertainty.     

Preservice elementary teachers' conceptions of moon phases before and after instruction

This study focused on the conceptual understandings held by 78 preservice elementary teachers about moon phases, before and after instruction. Participants in the physics groups received instruction on moon phases in an inquiry‐based physics course; participants in the methods group received no instruction on moon phases. The instructive effect of two different types of preinstruction interviews also was compared. The instruction on moon phases used in the study is from Physics by Inquiry by Lillian McDermott. In the study, the method of inquiry followed a qualitative design, involving classroom observations, document analysis, and structured interviews. Inductive data analysis identified patterns and themes in the participants' conceptual understanding. Results indicate that without the instruction, most preservice teachers were likely to hold alternative conceptions on the cause of moon phases. Participants who had the instruction were much more likely to hold a scientific understanding after instruction. The instruction appears to be more effective in promoting a scientific understanding of moon phases than instruction previously reported in the literature. It also appears that using a three‐dimensional model or making two‐dimensional drawings during the preinstruction interviews does not have instructive value. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 633–658, 2002     

Fun with numbers: Alternative models for predicting salary levels

The increasing awareness and concern with equity issues in higher education, along with the escalating litigation, has prompted institutions to undertake salary prediction studies. Four prediction models (built on a males only and total sample) were compared: (1) entering all variables, (2) excluding rank and tenure, (3) using predicted rank and tenure, and (4) using only objective variables. Models were tested using all permanent full-time faculty at a large midwestern university. Using predicted rank and tenure was the most suitable for equity studies. Including all variables yielded the best results for explaining/predicting reward systems. The other two models did not appear appropriate for either purpose. The males only sample consistently produced the largest bias effects. Institutions considering a salary prediction study should find these outcomes helpful in determining appropriate analytical strategies.     

Attention to semantic versus phonetic verbal attributes as a function of individual differences in arousal and learning strategy

It has been argued that deep processing of semantic information helps students to learn faster and perform better on classroom tests. Using paired associates tasks, it has been found that high arousal subjects make more errors when the response terms are phonetically similar. Subjects low on arousal make more errors when response words are semantically similar. If the encodings of semantic features are assumed to be “deeper” and more durable than the encodings of “shallow,” phonetic features, then studies have suggested that anxious students process shallowly and are thus at a disadvantage when learning information. The present study treats deep processing as a learning style and used the Synthesis—Analysis scale of the Inventory of Learning Processes to assess it. It is hypothesized that arousal would be negatively related to the learning style of deep processing. It is also hypothesized that the interaction obtained in earlier studies, i.e., greater susceptibility to semantic interference with low arousal and phonetic interference with high arousal, would occur only when Synthesis—Analysis scores are low. It is assumed that the habitual use of a deep processing strategy by students high on Synthesis—Analysis could counteract the limiting effect of arousal on cue utilization. The study provides support for both hypotheses.     

Examining contextual differences in the development of instructional leadership and school achievement

This study examined the generalizability of a principal instructional leadership model and its impact on school academic achievement across different school levels. The study tested the model across elementary and secondary school levels. The study also examined whether elementary school principals exert stronger instructional leadership influence over their school's academic achievement than high school principals. The results confirmed the fit of the same instructional leadership model to principals from both school levels. The results are discussed in terms of their theoretical and practical implications.     

Relationships between attitude and achievement among college biology students

The purposes of this study were to (1) study changes in attitude toward science, school, and academic self among college biology students, and (2) to examine relationships between attitudes and achievement in an introductory college course in biology. The three attitude variables were assessed at the beginning and end of the study. Each of the three constructs was measured by the semantic differential and one additional instrument. One cognitive measure, biology achievement, was taken at the beginning and end of the study. This was accomplished by using the Nelson Biology Test. Another cognitive measure, grade in the course, as given by the instructor, was recorded at the end of the course. Normative data and correlation coefficients among pre- and postadministrations were calculated for each institution and the composite sample as well. An analysis of variance showed that while gains in scores on the Nelson Biology Test were significant beyond the 0.01 level of probability, changes in attitude scores were not. Correlations were calculated between the attitude and cognitive variables in this study. Relationships between academic self-concept and achievement in biology were the strongest. Data from this study show that while student cognitive behavior was changed during an introductory college biology course, selected attitudes either stayed the same or became slightly more negative. Affective as well as cognitive gains would appear to be desirable goals in college courses. As we learn more about relationships that exist between cognition and affect, science educators at all levels will become better equipped to improve learning in science.     

诗歌和全球英语

诗歌是学生把英语作为外语学习的重要媒介,它能增强学生对语言的拥有感,帮助建立学生与英语之间的情感纽带,还能用来评价语言技巧的发展过程。诗歌能表达学生学习过程中经历的内心冲突和取得的成就感。他们自然地运用文学技巧如暗喻、明喻、夸张、平行结构、首语重复法、结句反复和押韵来描述自己的情感。他们通过文化视野的拓展,对就业机会、认知工具和与语言之间关系的正确评价,使自己的自豪感、自信心和自尊心得到增强,学习的热情对学习产生了积极的影响。     

Infant Temperament Measured by Multiple Observations and Mother Report

Observers and mothers rated infant behavior ( n = 50) in the home on dimensions of temperament once a week for 8 weeks. Although week-to-week correlations were modest (intraclass correlations of .14–.36), aggregates of the 8 observations had high reliability for both observers and mothers. Mother reports were tied to our observation sessions by having mothers ( a ) rate their infants' behavior during the period when our observations were made and ( b ) use a questionnaire that mirrored the scoring system used for scoring the videotaped observation sessions. When direct observations were compared with mother reports (on the aggregated weekly reports and on 4 widely used questionnaires), little evidence of mother-observer correspondence was found. The interpretation of the large literature that has used maternal report is discussed, as well as the importance of direct observation of infant behavior when temperament is assessed.