Four pigeons were exposed to several nonindependent concurrent variable-interval schedules of reinforcement. One schedule component required a keypecking response; the other component required a treadlepressing response. The birds matched the ratio of their behavior (as measured by responses and time) between the two topographically different responses to the ratio of reinforcement in those two components. When additional foods not contingent on a keypeck or treadle-press were then added, the birds matched time spent in the components to total rates of food delivered in those components; response matching was somewhat disrupted. The matching law, developed under concurrent variable-interval schedules requiring similar responses, can thus account for choice behavior involving topographically different responses. 相似文献
Experience gained in the construction of the world's first Geographical Information Systems tutor, ARCDEMO, emphasised the importance of accommodating different learning strategies. ARCDEMO, while highly successful, suffered from static graphical displays, a single pre-determined access path, and an overall design which restricted its scope in use. The Geographical Information System Tutor (GIST) was developed to address these problems using Apple's object-orientated HyperCard software. GIST incorporates a 'point-and-click' interface with graphical cues to initiate operations which include animated demonstrations, step-by-step illustrative graphics and graphical displays capable of user modification. The system was designed with two alternative access modes, serial or browsing , to allow different classes of user to work through the material in their preferred fashion. The use of GIST in undergraduate and short course teaching has shown how users respond well to the interface and find graphical explanations easy to follow. 相似文献
The primary aims of this study were twofold: (a) to describe average change in the written narrative performance of second grade students from the fall and spring of the school year and (b) examine patterns of individual growth to test for Matthew effects. Participants included 299 children in second grade. Microstructural measures were derived from students’ written narratives including: number of different words (NDW), total number of words (TNW), and accuracy of spelling and grammar. Significant increases in NDW, TNW, and spelling accuracy were evidenced from fall to spring. Students averaged 55 total words in the fall and averaged 69 words in the spring, with a statistically significant increase of 14 words t(299)?=?8.4, p?<?.0001). The variance in TNW from fall to spring increased from Var?=?791 to Var?=?1005, which was a significant increase and the correlation of initial Fall TNW and growth in TNW was also significant (r?=?0.39). Additionally, results from a two-level hierarchical linear model with students nested within teachers indicated that initial level of TNW predicted the change in TNW from fall to spring, with higher levels of initial TNW being related to larger gains in TNW. Significant predictors of Matthew effects included teacher or classroom and free/reduced lunch eligibility. Written personal narrative measures are sensitive to developmental change across a school year. Evidence of Matthew effects in lexical productivity suggests additional support may be warranted to ameliorate gaps in writing achievement.
Although the importance of phonological awareness has been discussed widely in the research literature, the concept is not well understood by many classroom teachers. In the study described here, we worked with groups of kindergarten and first-grade teachers (the experimental group) during a 2-week summer institute and throughout the school year. We shared with them research about learning disabilities and effective instruction, stressing the importance of explicit instruction in phonological and orthographic awareness. We followed the experimental group and a control group into their classrooms for a year, assessing teachers' classroom practices and their students' (n = 779) learning. The study yielded three major findings: We can deepen teachers' own knowledge of the role of phonological and orthographic information in literacy instruction; teachers can use that knowledge to change classroom practice; and changes in teacher knowledge and classroom practice can improve student learning. 相似文献
The author discusses how pursuing a rhetoric of science has consequences for both our understanding of science and our practice of rhetorical analysis. From a rhetorical perspective, science becomes a persuasive enterprise continuous with other persuasive practices in a culture. And rhetoric itself requires enrichment in three areas to become a better instrument of analysis for scientific texts; it needs to incorporate early modern dialectic, a more flexible stylistics, and an appreciation of the role of visualization in scientific argument. 相似文献
In this conceptual article, we focus on mentoring as a strategy to mend the cracks in the education pipeline for African American graduate students. Our article highlights the African American Mentoring Program (AAMP) model and examines the unique methods it uses to support the retention and graduation of African American graduate students from a university and their transition to the workforce. AAMP operates from a Transitional Cultural Framework and strives to bridge the gap between the students’ culture and the culture of the university. AAMP’s uniqueness is harnessed in its deep roots in culture, history, collectivism, and inter-generational sharing of knowledge. We end with implications and recommendations for universities and future research. 相似文献
The current research explored the theory of social goal orientation. More specifically, we conducted three studies utilizing six-independent university student samples to evaluate the construct validity of the Social Achievement Goal Orientation Scale (SAGOS; Ryan & Hopkins, 2003), a measure representing the construct of social goal orientation. The purpose of Study 1 was to: (1) compare the three-dimensional (mastery, performance-approach, and performance-avoidance) model of social goal orientation to three theoretically based competing models, (2) examine item functioning, and (3) assess generalizability of the factor structure. The fit of the proposed three-factor model was promising; however, areas of misfit and problematic items were identified. Stronger support for the three-factor structure of goal orientation was found using scores from an abbreviated 13-item SAGOS. In Study 2, item wording was altered slightly to evaluate a revised Social Achievement Goal Scale (SAGS), yet resulted in similar findings. Study 3 examined external validity evidence for the SAGS, garnering some support for the meaning of the scores. Although continued refinement of the SAGOS and SAGS is recommended, the findings help contribute to our general understanding and conceptualization of social goal theory and the role that social goals may play in academic contexts. 相似文献