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Sarah M. Shuwairi Rebecca Bainbridge Gregory L. Murphy 《Attention, perception & psychophysics》2014,76(6):1789-1802
Impossible figures are striking examples of inconsistencies between global and local perceptual structures, in which the overall spatial configuration of the depicted image does not yield a coherent three-dimensional object. In order to investigate whether structural “impossibility” is an important perceptual property of depicted objects, we used a category formation task in which subjects were asked to divide pictures of shapes into groups that seemed most natural to them. Category formation is usually unidimensional, such that sorting is dominated by a single perceptual property, so this task can serve as a measure of which dimensions are most salient. In Experiment 1, subjects received sets of 12 line drawings consisting of six possible and six impossible objects. Very few subjects grouped the figures by impossibility on the first try, and only half did so after multiple attempts at sorting. In Experiment 2, we investigated other global properties of figures: symmetry and complexity. Subjects readily sorted objects by complexity, but seldom by symmetry. In Experiment 3, subjects were asked to draw each of the figures before sorting them, which had only a minimal effect on categorization. Finally, in Experiment 4, subjects were explicitly instructed to divide the shapes by symmetry or impossibility. Performance on this task was perfect for symmetry, but not for impossibility. Although global properties of figures seem extremely important to our perception, the results suggest that some of these cues are not immediately obvious or salient for most observers. 相似文献
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The Impact of a Precision Teaching Intervention on the Reading Fluency of Typically Developing Children
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This research investigated the efficacy of precision teaching (PT) on the reading fluency of typically developing children, aged 7–8 years. Seven participants were assigned to a PT intervention group and received 6 weeks of fluency training using Say All Fast a Minute Every Day Shuffled (SAFMEDS) fluency cards (Phase 1) and a Dolch story (Phase 2). Outcomes were measured using multiple baseline design (MBD) data, Standard Celeration Charts, and pre‐intervention–post‐intervention fluency scores. The MBD data show increased correct responding for PT participants from baseline to the end of each intervention phase. These improvements were maintained at a 3‐week post‐intervention follow‐up. The MBD clearly demonstrated a replication of intervention effects across participants. The study supports prior research in this area showing that PT can lead to large and socially relevant gains in children's reading fluency. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Perceiving one's causal control is important for adaptive behavior. Studying depression and other individual differences has provided insight into typical as well as pathological causal processing. We set out to study factors that have been shown to distinguish those with and without signs of depression and affect perceptions of causal control: levels of behavior, the availability of outcomes and learning about the environment or context. Two experiments were carried out in which participants, scoring low and high on the Beck Depression Inventory using established cutoffs, completed a causal control task, in which outcomes occurred with a low (.25) or high probability (.75). Behavior levels were either constrained (N1 = 73) or unconstrained (N2 = 74). Overall, findings showed that levels of behavior influenced people's experiences of the context in which events occurred. For all participants, very high behavior levels eliminated sensitivity to levels of outcomes occurring in the environment and lead to judgments that were consistent with conditional probabilities as opposed to the experimenter programmed contingency. Thus increased behavior increased perceived control via influence on context experience. This effect was also evident for those scoring high on the BDI. Overall conclusions are that behavior and context provide two important interlinked psychological pathways to perceived control. However, situations that constrain people's ability to respond freely can prevent people with signs of depression from taking control of a situation that would otherwise be uncontrollable. 相似文献
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