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71.
Longitudinal studies are necessary to examine individual change over time, with group status often being an important variable in explaining some individual differences in change. Although sample size planning for longitudinal studies has focused on statistical power, recent calls for effect sizes and their corresponding confidence intervals underscore the importance of obtaining sufficiently accurate estimates of group differences in change. We derived expressions that allow researchers to plan sample size to achieve the desired confidence interval width for group differences in change for orthogonal polynomial change parameters. The approaches developed provide the expected confidence interval width to be sufficiently narrow, with an extension that allows some specified degree of assurance (e.g., 99%) that the confidence interval will be sufficiently narrow. We make computer routines freely available, so that the methods developed can be used by researchers immediately. 相似文献
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At the time of this writing, a widely publicized, waived-consent trial is underway. Sponsored by Northfield Laboratories, Inc. (Evanston, IL) the trial is intended to evaluate the emergency use of PolyHeme?, an oxygen-carrying resuscitative fluid that might prevent deaths from uncontrolled bleeding. The protocol allows patients in hemorrhagic shock to be randomized between PolyHeme? and saline in the field and, still without consent, randomized between PolyHeme? and blood after arrival at an emergency department. The Federal regulations that govern the waiver of consent restrict its applicability to circumstances where proven, satisfactory treatments are unavailable. Blood-the standard treatment for hemorrhagic shock-is not available in ambulances but is available in hospitals. The authors argue that the in-hospital stage of the study fails to meet ethical and regulatory standards. 相似文献
74.
The information content of panoramic images II: view-based navigation in nonrectangular experimental arenas 总被引:2,自引:0,他引:2
Cheung A Stürzl W Zeil J Cheng K 《Journal of experimental psychology. Animal behavior processes》2008,34(1):15-30
Two recent studies testing navigation of rats in swimming pools have posed problems for any account of the use of purely geometric properties of space in navigation (M. Graham, M. A. Good, A. McGregor, & J. M. Pearce, 2006; J. M. Pearce, M. A. Good, P. M. Jones, & A. McGregor, 2004). The authors simulated 1 experiment from each study in a virtual reality environment to test whether experimental results could be explained by view-based navigation. The authors recorded a reference image at the target location and then determined global panoramic image differences between this image and images taken at regularly spaced locations throughout the arena. A formal model, in which an agent attempts to minimize image differences between the reference image and current views, generated trajectories that could be compared with the search performance of rats. For both experiments, this model mimics many aspects of rat behavior. View-based navigation provides a sufficient and parsimonious explanation for a range of navigational behaviors of rats under these experimental conditions. 相似文献
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Cunningham CE Deal K Rimas H Buchanan DH Gold M Sdao-Jarvie K Boyle M 《Journal of abnormal child psychology》2008,36(7):1123-1138
Although materials informing parents about children’s mental health (CMH) problems can improve outcomes, we know relatively
little about the design factors that might influence their utilization of available resources. We used a discrete choice conjoint
experiment to model the information preferences of parents seeking mental health services for 6 to 18 year olds. Parents completed
30 choice tasks presenting experimentally varied combinations of 20 four-level CMH information content, transfer process,
and outcome attributes. Latent class analysis revealed three segments with different preferences. Parents in the Action segment
(43%) chose materials providing step-by-step solutions to behavioral or emotional problems. They preferred weekly meetings
with other parents and coaching calls from a therapist. The Information segment (41%) chose materials helping them understand
rather than solve their child’s problems. These parents were more sensitive to logistical factors such as receiving information
in groups, the location where information was available, the modality in which the information was presented, and the time
required to obtain and use the information. The Overwhelmed segment (16%) reported more oppositional and conduct problems,
felt their children’s difficulties exerted a greater adverse impact on family functioning, and reported higher personal depression
scores than those in the Action or Information segments. Nonetheless, they did not choose information about, or solutions
to, the problems their children presented. Simulations predicted that maximizing utilization and realizing the potential benefits
of CMH information would require knowledge transfer strategies consistent with each segment’s preferences.
相似文献
Charles E. CunninghamEmail: |
77.
Face detection, the process of finding a face in a visual scene, is a critical step in face processing, yet it has received relatively little attention compared with other face processes. The present study addresses this crucial first stage by investigating the effect of inversion on face detection and by examining how individuals with developmental prosopagnosia perform on face detection tasks. Fourteen control participants and fourteen individuals with developmental prosopagnosia (DPs) were tested with two face detection tasks: (1) Face versus Non‐Face, where arrays of small images were presented, one of which could contain a face and (2) Face versus Face Parts, where a two‐tone face could be embedded in a larger array of similar two‐tone face parts. On each trial, participants made a speeded response if a face was present in the visual display. On almost all measures both normal and prosopagnosic individuals showed strong inversion effects with significantly worse performance with inverted faces. This shows that the simple task of detection can show inversion effects comparable to those seen for other face tasks, including recognition. Finally, while there were prosopagnosics who were well within the normal range for detection, there were significant group differences, particularly for the case of the Face versus Face Parts, where prosopagnosics were worse than controls on upright but not on inverted face detection. 相似文献
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79.
Recognition confidence and the explicit awareness of memory retrieval commonly accompany accurate responding in recognition tests. Memory performance in recognition tests is widely assumed to measure explicit memory, but the generality of this assumption is questionable. Indeed, whether recognition in nonhumans is always supported by explicit memory is highly controversial. Here we identified circumstances wherein highly accurate recognition was unaccompanied by hallmark features of explicit memory. When memory for kaleidoscopes was tested using a two-alternative forced-choice recognition test with similar foils, recognition was enhanced by an attentional manipulation at encoding known to degrade explicit memory. Moreover, explicit recognition was most accurate when the awareness of retrieval was absent. These dissociations between accuracy and phenomenological features of explicit memory are consistent with the notion that correct responding resulted from experience-dependent enhancements of perceptual fluency with specific stimuli--the putative mechanism for perceptual priming effects in implicit memory tests. This mechanism may contribute to recognition performance in a variety of frequently-employed testing circumstances. Our results thus argue for a novel view of recognition, in that analyses of its neurocognitive foundations must take into account the potential for both (1) recognition mechanisms allied with implicit memory and (2) recognition mechanisms allied with explicit memory. 相似文献
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