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High rates of aggressive-disruptive behavior exhibited by children during their initial years of elementary school increase their risk for significant behavioral adjustment problems with teachers and peers. The purpose of the present study was to examine the unique and combined contributions of child vulnerabilities and school context to the development of aggressive-disruptive student behavior during first grade. Parent ratings and child interviews assessed three child characteristics associated with risk for the development of aggressive behavior problems in elementary school (aggressive-disruptive behaviors at home, attention problems, and social cognitions) in a sample of 755 first-grade children in four demographically diverse American communities. Two school characteristics associated with student aggressive-disruptive behavior problems (low-quality classroom context, school poverty levels) were also assessed. Linear and multilevel analyses showed that both child and school characteristics made independent and cumulative contributions to the development of student aggressive-disruptive behavior at school. Although rates of student aggressive-disruptive behavior varied by gender and race, the predictive model generalized across all groups of children in the study.  相似文献   
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Dual task and priming paradigms were combined to investigate the distinction between automatic and attentional processes. Subjects in two experiments performed a primed letter-matching and a tone discrimination task separately and concurrently. The interval between prime onset and letter pair (SOA) was varied from 50 to 500 msec. Cost-benefit analyses in Experiment 1 indicated that primes that matched target letter pairs began to facilitate performance at an SOA of 150 msec. Primes inhibited performance when they mismatched identical letter pairs at SOA 100. In the dual-task situation, the benefits of priming letter targets were reflected in probe latencies with no evidence of concurrent costs in tone latencies. Experiment 2 revealed that two tasks could be primed simultaneously as effectively as when each was primed alone. Findings are discussed in reference to Posner and Snyder's (1975a, 1975b) two-process theory of priming and the applicability of a secondary task technique.  相似文献   
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A Great Plains land ethic is shaped by an intimate knowledge of and appreciation for the evolution, ecology, and aesthetics of the plains landscape. The landscape evokes a sense of wonder and mystery suggested by the word "sacrament." The biblical concept of "covenant" points to God as a community-forming power, a creative process that has evolved into the earth community to which we humans belong. In contrast to an anthropocentric ethic which emphasizes human dominion over nature, a Theo-centric land ethic seeks a balance, reflected in Genesis 1–3, between humans who are members of the earth community and moral agents accountable to God for the earth. A land ethic identifies concrete practices of metanoia and healing: agricultural practices to address the loss and degradation of soil; conservation and protection of water sources; utilization of wind and solar energy; and prescribed burning to restore processes vital to the prairie ecosystem. The concept of subsidiarity suggests that practices of metanoia and healing are a combination of wise public policy balanced by personal, family, church, business, and community responsibility.  相似文献   
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