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771.
Michael W. Kirkwood Amy K. Connery John W. Kirk David A. Baker 《Child neuropsychology》2013,19(2):245-252
In adult populations, embedded performance validity indicators are well established, as they are time efficient, resistant to coaching, and allow for more continuous monitoring of effort than standalone measures. Although several recent studies have demonstrated the appropriateness of using standalone validity tests with school-age children, a paucity of pediatric work has examined embedded indicators. The present study investigated the value of a simple automatized sequences task to detect performance invalidity in 439 clinically referred patients with mild head injury aged 8 through 17 years. Sixteen percent of the participants failed the Medical Symptom Validity Test (MSVT). Thirteen percent failed the MSVT and also performed below established cutoffs on either the Test of Memory Malingering or Wechsler Digit Span subtest. The group classified as providing invalid data performed significantly worse than the group passing the MSVT across all sequencing conditions. Sensitivity and specificity for the total time on the sequencing task compared favorably to data produced for many respected adult-based embedded indicators (i.e., sensitivity around 50% when specificity ≥ 90%). Classification statistics for any embedded performance validity test can be expected to be worse in more severely affected populations; however, the current sequencing task appears to have value in detecting invalid performance in relatively high-functioning older children and adolescents. The fact that the task takes less than a couple of minutes to administer makes it especially appealing. 相似文献
772.
Angela Heine Sascha Tamm Bert De Smedt Michael Schneider Verena Thaler Joke Torbeyns 《Child neuropsychology》2013,19(5):461-477
Sixty-six primary school children were selected, of which 21 scored low on a standardized math achievement test, 23 were normal, and 22 high achievers. In a numerical Stroop experiment, children were asked to make numerical and physical size comparisons on digit pairs. The effects of congruity and numerical distance were determined. All children exhibited congruity and distance effects in the numerical comparison. In the physical comparison, children of all performance groups showed Stroop effects when the numerical distance between the digits was large but failed to show them when the distance was small. Numerical distance effects depended on the congruity condition, with a typical effect of distance in the congruent, and a reversed distance effect in the incongruent condition. Our results are hard to reconcile with theories that suggest that deficits in the automaticity of numerical processing can be related to differential math achievement levels. Immaturity in the precision of mappings between numbers and their numerical magnitudes might be better suited to explain the Stroop effects in children. However, as the results for the high achievers demonstrate, in addition to numerical processing capacity per se, domain-general functions might play a crucial role in Stroop performance, too. 相似文献
773.
Michael W. Kirkwood John W. Kirk Robert Z. Blaha Pamela Wilson 《Child neuropsychology》2013,19(6):604-618
Neuropsychological test interpretation rests upon the assumption that the examinee has exerted full effort. If an individual provides inadequate effort during exam, the resulting data will be invalid and represent an underestimate of the person's true abilities. Although youth have been assumed historically to be less capable of deception than adults, acts of deception in childhood are not uncommon, even in normative populations. Yet, very few cases of children who have provided suboptimal effort during neuropsychological exam have appeared in the scientific literature. We present six clinical cases illustrating that children down to at least age 8 years can present with noncredible performance. The cases include those in which clear external incentives could be identified to those in which intrinsic or psychological factors were presumed to predominate. The fairly diverse nature of the presented cases, along with other recent work, suggests that suboptimal effort in children is apt to occur more frequently than previously recognized, even if it might occur less often than in comparable adult samples. In most of the presented cases, noncredible performance would not have been detected definitively by clinical judgment alone, reinforcing the value of routinely incorporating symptom validity tests into the neuropsychological assessment of school-aged children. The number of effort tests that have demonstrated utility in children pales in comparison to those available to the adult practitioner, although recent research now supports the use of several standalone measures with pediatric patients. 相似文献
774.
A unique structure, a network of nanotwins, is revealed for the first time in high-energy ion-irradiated YBa2Cu3O7-delta. This structure is shown to form only at ion doses of 1011 cm-2 or greater and thus is not revealed in any earlier electron microscopy studies. In this higher-dose regime, the well known columnar defects are connected by the nanotwin structure, thus affecting bulk superconducting properties. Consequences for a number of published interpretations of such measurements related to pinning and dynamics of magnetic vortices are discussed. 相似文献
775.
776.
Interest in mindfulness and its enhancement has burgeoned in recent years. In this article, we discuss in detail the nature of mindfulness and its relation to other, established theories of attention and awareness in day-to-day life. We then examine theory and evidence for the role of mindfulness in curtailing negative functioning and enhancing positive outcomes in several important life domains, including mental health, physical health, behavioral regulation, and interpersonal relationships. The processes through which mindfulness is theorized to have its beneficial effects are then discussed, along with proposed directions for theoretical development and empirical research. 相似文献
777.
778.
Kirk R. Blankstein Gordon L. Flett Mark S. Watson Spomenka Koledin 《Anxiety, stress, and coping》2013,26(3):193-204
Abstract The present research examined the extent to which sleep disturbance is involved in the experience of test anxiety. In Study 1, a sample of 80 subjects completed a trait measure of test anxiety and completed a sleep inventory with reference to the past 30 days. In Study 2, a sample of 188 subjects provided measures of trait and state test anxiety and completed a sleep inventory for the night preceding an actual test. The results of Study 1 and Study 2 confirmed that test anxiety is associated with self-reported sleep disturbance. In addition, the results of Study 2 showed that sleep disturbance is also associated with increased state test anxiety. Finally, it was found in Study 2 that sleep disturbance was not related to actual test performance. However, poorer test performance was associated with increased state and trait test anxiety. It is concluded that certain characteristics associated with test anxiety are stable and may be detected in evaluative and non-evaluative situations. The results are discussed with particular reference to their implications for the test anxiety construct itself as well as treatment strategies for the test-anxious student. 相似文献
779.
Luc Schneider 《Axiomathes》2013,23(2):419-442
Nexuses such as exemplification are the fundamental ties that structure reality as a whole. They are “formal” in the sense of constituting the form, not the matter of reality and they are “transcendental” inasmuch as they transcend the categorial distinctions between the denizens of reality, including that between existents and non-existents. I shall advocate a moderately particularist view about (external) nexuses and argue that it provides not only the best solution to Bradley’s regress, but also an elegant account of symmetrical relations (both formal and material), as well as of temporal and modal change. These advantages are illustrated by the reconstruction of an Aristotelian ontology of exemplification involving substances, kinds and material attributes. 相似文献
780.
In four experiments, participants made a speeded manual response to a tone and concurrently selected a cued visual target from a masked display for later unspeeded report. In contrast toaprevious study of H.Pashler (1991), systematic interactions between the two tasks were obtained. First, accuracy in both tasks decreased with decreasing stimulus (tone-display)-onset asynchrony (SOA)— presumably due to a conflict between stimulus and response coding. Second, spatial correspondence between manual response and visual target produced better performance in the visual task and, with short SOAs, in the tone task, too— presumably due to the overlap of the spatial codes used by stimulus- and response-selection processes. Third, manual responding slowed down with increasing SOA — reflecting either a functional bottleneck or strategic queuing of target selection and response selection. Results suggest that visual stimulus selection and manual response selection are distinct mechanisms that operate on common representations. 相似文献