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61.
Yaowen Hsu 《Psychometrika》2000,65(4):547-549
The relationship between the EM algorithm and the Bock-Aitkin procedure is described with a continuous distribution of ability
(latent trait) from an EM-algorithm perspective. Previous work has been restricted to the discrete case from a probit-analysis
perspective.
The author is grateful to Bradley A. Hanson for valuable discussion and comments. Thanks also go to Terry A. Ackerman, Meichu
Fan, Subrata Kundu, and Robert K. Tsutakawa for their help and encouragement in this study. 相似文献
62.
63.
Post-choice information processing by pigeons 总被引:2,自引:2,他引:0
In a conditional discrimination (matching-to-sample), a sample is followed by two comparison stimuli, one of which is correct, depending on the sample. Evidence from previous research suggests that if the stimulus display is maintained following an incorrect response (the so-called penalty-time procedure), acquisition by pigeons is facilitated. The present research tested the hypothesis that the penalty-time procedure allows the pigeons to review and learn from the maintained stimulus display following an incorrect choice. It did so by including a penalty-time group for which, following an incorrect choice, the sample changed to match the incorrect comparison, thus providing the pigeons with post-choice misinformation. This misinformation group acquired the matching task significantly slower than the standard penalty-time group (that had no change in the sample following an error). Furthermore, acquisition of matching by a control group that received no penalty time fell midway between the other two groups, suggesting that the pigeons did not merely take more care in making choices because of the aversiveness of penalty-time. Thus, it appears that in the acquisition of matching-to-sample, when the stimulus display is maintained following an incorrect choice, the pigeons can review or acquire information from the display. This is the first time that such an effect has been reported for a nonhuman species. 相似文献
64.
三种常用DIF检测方法的比较研究 总被引:6,自引:1,他引:5
本研究在对DIF作出新的更为严格的界定、对三种常用的DIF检澍方法进行详细介绍的基础上.以1999年高考英语试卷75道选择题为研究材料,对三种常用的DIF检测方法进行了实证研究。结果表明:MH方法与SIBTEST方法检测的敏感性较STND方法高;MH方法与SIBTEST方法检出的一致性很高;SIBTEST方法具有较好的性能,在实际应用中可以作为首选的方法;在进行DIF检测时,样本容量在1000左右为宜。 相似文献
65.
Davis JK 《Theoretical medicine and bioethics》2007,28(1):1-30
Moral decision procedures such as principlism or casuistry require intuition at certain junctures, as when a principle seems
indeterminate, or principles conflict, or we wonder which paradigm case is most relevantly similar to the instant case. However,
intuitions are widely thought to lack epistemic justification, and many ethicists urge that such decision procedures dispense
with intuition in favor of forms of reasoning that provide discursive justification. I argue that discursive justification does not eliminate or minimize the need for intuition, or constrain our intuitions.
However, this is not a problem, for intuitions can be justified in easy or obvious cases, and decision procedures should be
understood as heuristic devices for reaching judgments about harder cases that approximate the justified intuitions we would
have about cases under ideal conditions, where hard cases become easy. Similarly, the forms of reasoning which provide discursive
justification help decision procedures perform this heuristic function not by avoiding intuition, but by making such heuristics
more accurate. Nonetheless, it is possible to demand too much justification; many clinical ethicists lack the time and philosophical
training to reach the more elaborate levels of discursive justification. We should keep moral decision procedures simple and
user-friendly so that they will provide what justification can be achieved under clinical conditions, rather than trying to maximize our epistemic justification out of an overstated concern
about intuition. 相似文献
66.
The aim of this study was to evaluate whether emergent conditional relations could be established with a go/no-go procedure using compound abstract stimuli. The procedure was conducted with 6 adult humans. During training, responses emitted in the presence of certain stimulus compounds (A1B1, A2B2, A3B3, B1C1, B2C2, and B3C3) were followed by reinforcing consequences (points); responses emitted in the presence of other compounds (A1B2, A1B3, A2B1, A2B3, A3B1, A3B2, B1C2, B1C3, B2C1, B2C3, B3C1 and B3C2) were not (i.e., extinction). During subsequent tests of emergent relations, new configurations (BA, CB, AC, and CA relations) were presented, formed by the recombination of training stimuli and structurally resembling tests usually employed in stimulus equivalence studies. Results showed that all 6 participants displayed immediate emergence of relations consistent with symmetry. Four participants exhibited emergent relations consistent with both transitivity and equivalence. These results indicate that a go/no-go procedure with compound stimuli can establish emergent conditional relations, thus providing a procedural alternative to the matching-to-sample procedures commonly used in studies of stimulus equivalence. 相似文献
67.
阅读中文时信息整合的即时性 总被引:3,自引:1,他引:2
通过两个实验对中文语篇理解中相关背景信息的激活与整合到底是即时发生抑或延时进行这一问题进行了探讨。研究所用的阅读材料都包含一个目标句,它与局部语境一致,但与前文提供的背景信息冲突或无关。实验一采用自定步速逐行阅读技术,考察了一致性条件以及句子结束的标记(即句号)是否存在对目标句阅读时间的影响。结果发现,句子结束的标记是否存在并不影响目标句整合加工的进行。实验二运用眼动追踪技术着重探讨信息整合加工能否在目标句关键区中即时进行,实验条件仍为当前信息与背景信息的一致性,重点考察其对目标句中关键前区、关键区及关键后区的作用。结果表明,自变量的操纵导致关键区中反映初次加工的指标产生可靠的效应。这一结果表明中文语篇理解中整合加工的过程开始得非常迅速,是一个即时引发、而非延时进行的过程 相似文献
68.
69.
Investigating Maternal Touch and Infants' Self‐Regulatory Behaviours during a Modified Face‐to‐Face Still‐Face with Touch Procedure 下载免费PDF全文
Maternal touch and infants' self‐regulatory behaviours were examined during a modified Still‐Face with Touch (SF + T) procedure. Mothers and their 5½‐month‐old infants participated in one period of Normal interaction followed by three SF + T periods. Maternal functions of touch, and infants' self‐regulatory behaviour, affect, and attention were evaluated. Contrary to a typical SF procedure, the amount of smiling remained high while fretting remained low. High levels of maternal touching and variations in the functions of maternal touch were observed across periods. Playful touch remained high while there was an increase in nurturing touch and a decrease in attention‐getting touch from the Normal to all SF + T periods. Similar amounts of self‐regulatory behaviours were observed across periods with the exception of a decrease in bidirectional exchanges during the SF + T periods. Finally, across periods, maternal touch and infants' self‐regulatory behaviours were found to be temporally organized with infants' affect and attention. Examining how mothers use touch when other forms of communication are absent increased our understanding of the role of touch in infants' emotion regulation. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
70.