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Twenty acquisition curves were obtained from each of 8 pigeons in a free-operant choice procedure. Every condition began with a phase in which two response keys had equal probabilities of reinforcement, and, as a result, subjects’ responses were divided fairly evenly between the two keys. This was followed by a phase in which one key had a higher probability of reinforcement than the other, and the development of preference was observed. In all but a few cases, response proportions increased for the key with the higher probability of reinforcement. In most conditions, the two probabilities differed by .06, but the actual probabilities varied (from .16 and .10 in one condition to .07 and .01 in another). Development of preference for the key with the higher probability of reinforcement was slower when the ratio of the two reinforcement probabilities was small (.16/.10) than when it was large (.07/.01). This finding is inconsistent with the predictions of several different quantitative models of acquisition, including the kinetic model (Myerson & Miezin, 1980) and the ratio-invariance model (Horner & Staddon, 1987). However, the finding is consistent with a hypothesis based on Weber’s law, which states that the two alternatives are more discriminable when the ratio of their reinforcement probabilities is larger, and, as a result, the acquisition of preference is faster. 相似文献
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Theresa Ambo 《International journal of qualitative studies in education》2018,31(3):215-222
AbstractLiterature on American Indian student support in postsecondary education illustrates the importance of relationality in creating a positive college experience for Native students. That said, much of the literature examining ‘care relationships’ in Indian education focuses on student outcomes, with less attention given to the experiences of practitioners. Thus, the purpose of this paper is twofold. First, the author examines where and how American Indian higher education practitioners learned principles of communal care for supporting Indigenous students in non-Native postsecondary institutions. Second, she explores how these principles act as homesteads of mutuality to love, transform, resist, and enact refusal within the academy. She draws upon the literature on American Indian student support in postsecondary education, which illustrates the importance of relationality in creating a positive college experience for Native students. 相似文献
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A Methylome‐Wide Association Study of Trajectories of Oppositional Defiant Behaviors and Biological Overlap With Attention Deficit Hyperactivity Disorder 下载免费PDF全文
Edward D. Barker Esther Walton Charlotte A.M. Cecil Richard Rowe Sara R. Jaffee Barbara Maughan Thomas G. O'Connor Argyris Stringaris Alan J. Meehan Wendy McArdle Caroline L. Relton Tom R. Gaunt 《Child development》2018,89(5):1839-1855
In 671 mother–child (49% male) pairs from an epidemiological birth cohort, we investigated (a) prospective associations between DNA methylation (at birth) and trajectories (ages 7–13) of oppositional defiant disorder (ODD), and the ODD subdimensions of irritable and headstrong; (b) common biological pathways, indexed by DNA methylation, between ODD trajectories and attention deficit hyperactivity disorder (ADHD); (c) genetic influence on DNA methylation; and (d) prenatal risk exposure associations. Methylome‐wide significant associations were identified for the ODD and headstrong, but not for irritable. Overlap analysis indicated biological correlates between ODD, headstrong, and ADHD. DNA methylation in ODD and headstrong was (to a degree) genetically influenced. DNA methylation associated with prenatal risk exposures of maternal anxiety (headstrong) and cigarette smoking (ODD and headstrong). 相似文献
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The unskilled and unaware effect refers to the finding that individuals who are less knowledgeable or less skilled in a domain are relatively less able to evaluate their level of skill or effectively utilise feedback relative to individuals who are more skilled. Studies finding deaf students less accurate than hearing students in estimating their English vocabulary knowledge and in judging how much they are learning from material presented via sign language have attributed those results to the unskilled and unaware effect, citing the lack of language fluencies frequently demonstrated among deaf learners. The present study addressed the issue more directly by comparing both deaf and hearing individuals who were more and less skilled in four domains, three linguistic and one nonlinguistic. Results indicated that even individuals who are unskilled in a nonlinguistic domain can evaluate their performance when they are aware of what skilled performance would look like, and that unskilled and unaware effects can be influenced by individuals’ desires to be skilled. 相似文献
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Theresa J. K. Drinka 《Educational gerontology》2013,39(6):433-449
Each of the fields of geriatrics and interdisciplinary practice intensifies the usefulness and effectiveness of the other. Combining geriatrics and interdisciplinary practice also magnifies the complexity of two singularly complex fields. However, the subtle reasons for their complexity may escape the understanding of clinicians, educators, policy makers, and administrators. Attempting to treat older patients who have complex problems while ignoring common principles of geriatrics and teamwork can cause a kind of double jeopardy. It can potentially harm the patient and decrease the provider's sense of mastery. Training either students or health care providers to appreciate the interactions and the complexities of these two fields could produce a double indemnity for the health care system and for older persons who need health care. It requires recognizing subtle factors like the barrier of presumed knowledge, the interpretation of the meaning of function, frailty, the lure of medical technology, professional hierarchies, diverse views of disease, and the myth of insufficient evidence. 相似文献
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Theresa A. Adkins 《Multicultural Perspectives》2013,15(2):73-81
In this article the author presents a collective case study of two English teachers identified as particularly successful with Black students. Through the use of ethnographic techniques, the study provides a snapshot of how these teachers facilitated academic gains in urban high schools through their use of culturally responsive English instruction. 相似文献
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Theresa Parvin Steward 《Popular Communication》2017,15(3):207-220
ABSTRACTRather than resisting either new or old culture, Iranian musicians in the diaspora embrace both their new host environments and their native homeland, as they create a place between cultural assimilation and preservation, helping to shape new sounds of exile. This essay explores how Iranian musicians embrace the new and the familiar, the traditional and the popular, creating an original cultural hybrid. Questions of cultural identity and the politics of location and displacement are addressed using a theoretical cultural studies framework, incorporating themes of personal and collective nostalgia. This discussion is supplemented by documented narrative experiences from Iranian musicians and artists. Furthermore, the textual and musical analysis of singer-songwriter Mohsen Namjoo’s readaptation of the familiar Mexican ranchera song “Cielito Lindo” uncovers unique nuances and layers of meaning that not only shed light on one musician’s personal journey to exile, but also speak to a greater collective experience of Iranians today who continue to be torn between home and homeland. 相似文献