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In Experiment I rats were trained for 21÷2 days under partial (PRF) or continuous reinforcement (CRF) conditions starting at 18, 22, 28, or 36 days of age and were then subjected to immediate extinction. At all ages there was a strong partial reinforcement extinction effect (PREE), and absolute size of PREE was greatest in the youngest rats. Rate of extinction increased as a function of age following both CRF and PRF. In Experiment II the youngest and oldest age groups of Experiment I were run under the two reward conditions of Experiment I and in a third condition, PRF with number of rewards rather than trials equated to CRF (PRF-R). The PRF-R and PRF groups were not different in extinction, and both were more persistent than CRF. The youngest rats were again more persistent than the oldest, particularly after PRF training. In Experiment III it was shown that the well-known paradoxical effect, greater reward in CRF acquisition leads to faster extinction, operates in our youngest and oldest animals, but is more pronounced in the oldest. The results are discussed in terms of whether they require different explanations than those often applied to extinction data from adult rats. 相似文献
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In two experiments rats were given straight-alley training in the following sequence: continuous reward (CR), partial reward (PR), extinction (EXT). Independent groups differed only in the amount of CR training. In both experiments,. early-EXT performance was directly related to amount of CR training and late-EXT performance was inversely related to amount of CR training. These data were related to a possible specific sF intensity hypothesis, an extension of frustration theory. 相似文献
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Following barpress training with different terminal fixed ratios (FR), rats were given the interpolated experiences of runway acquisition and extinction (as part of another experiment) followed by 2 months of vacation. Then they were tested in FR 10 barpress reacquisition, FR 10 barpress extinction, consistently reinforced runway reacquisition, and a second runway extinction. In a start (response initiation) measure, resistance to extinction during the FR 10 extinction and in the second runway extinction was positively related to the terminal FR values of the initial barpress training, an indication of highly durable differential persistence effects attributable to the initial training to different terminal fixed ratios of barpress responding. 相似文献
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This article, using a variety of data from the Rowntree Research Project at the University of Lancaster, attempts to reconstruct student and staff perceptions of the teaching/learning reality of higher education, and in particular their perceptions of excellence. Ambiguities and confusions are noted in staff perceptions of excellence and important differences between staff and students in their perception of teaching/learning realities.It concludes by discussing implications for staff/student communication and for the admission of students to higher education.This article is a shortened and partly rewritten version of a paper of the same title delivered at the Third International Conference on Higher Education, University of Lancaster, September 1975. 相似文献
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Percy Abram Beth Scarloss Nicole Holthuis Elizabeth Cohen Rachel Lotan Susan E. Schultz 《Asia Pacific Journal of Education》2002,22(1):16-27
Teachers remark that during Cooperative Learning (CL), the academic nature of the group discussions and the resulting group products can be disappointing. Often, this may be due to a lack of understanding on the students’ part on the elements that make up an exemplary product. This study examined whether clearly articulated evaluation criteria (EC's) would alter the nature of the group's discussion and subsequently improve students’ learning. The groups using the EC spent more time evaluating their products, discussing the content of their unit and task than students not using the evaluation criteria. The evaluative and task‐focused talk at the group level were modestly, yet significantly correlated with individual scores on an essay test following the unit. These findings suggest that the presence of clear and accessible criteria for evaluation can improve the academic nature of group discussions and individual learning gains. The findings provide a practical way to apply current assessment practices to classrooms using CL strategies. 相似文献
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In the first experiment, a prolonged period of intermittent, unsignaled shocks preceded appetitive runway acquisition, under either continuous (CRF) or partial reinforcement (PRF) and extinction. In the second experiment, the shock treatment came between CRF or PRF acquisition and extinction; and in the third experiment, the shocks intervened between appetitive CRF acquisition and shock-punishment extinction. The main finding was that compared with an unshocked control, shock facilitated acquisition in Experiment 1, and led to increased resistance to extinction and/or punishment in all experiments. In Experiment 1, the shock effect in appetitive extinction was seen mainly in the CRF group; in Experiment 2, the effect was to increase persistence in both the CRF and PRF groups; and in Experiment 3, shock treatment produced stronger resistance to punished extinction. The discussion is in terms of habituation and a general theory of persistence, and the concept of helplessness. 相似文献