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The spans of apprehension of hyperactive and normal boys were compared with a forced-choice letter-recognition task developed by Estes (1965). This task provides an estimate of the span which is relatively insensitive to either memory or motivational influences. The span size was the same for both groups when visual noise was absent. In the presence of noise, span size for the hyperactive boys decreased. Moreover, as the number of noise letters increased, the reduction in span size observed for the hyperactive boys increased. It is argued that this increasing reduction in span size represents a true deficit in attention. 相似文献
104.
McIntyre LL Gresham FM DiGennaro FD Reed DD 《Journal of applied behavior analysis》2007,40(4):659-672
We reviewed all school-based experimental studies with individuals 0 to 18 years published in the Journal of Applied Behavior Analysis (JABA) between 1991 and 2005. A total of 142 articles (152 studies) that met review criteria were included. Nearly all (95%) of these experiments provided an operational definition of the independent variable, but only 30% of the studies provided treatment integrity data. Nearly half of studies (45%) were judged to be at high risk for treatment inaccuracies. Treatment integrity data were more likely to be included in studies that used teachers, multiple treatment agents, or both. Although there was a substantial increase in reporting operational definitions of independent variables, results suggest that there was only a modest improvement in reported integrity over the past 30 years of JABA studies. Recommendations for research and practice are discussed. 相似文献
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Terrestrial gravity restricts human locomotion to surfaces in which turns involve rotationsaround the body axis. Because observers are usually upright, one might expect the effects of gravity to induce differences in the processing of vertical versus horizontal turns. Subjects observed visual scenes of bending tunnels, either statically or dynamically, as if they were moving passively through the visual scene and were then asked to reproduce the turn deviation of the tunnel with a trackball. In order to disentangle inertia-related (earth-centered) from vision-related (body-centered) factors, the subjects were either upright or lying on their right side during the observations. Furthermore, the availability of continuous optic flow, geometrical cues, and eye movement were manipulated in three experiments. The results allowed us to characterize the factors' contributions as follows. Forward turns (pitch down) with all cues were largely overestimated, as compared with backward turns (pitch up). First, eye movements known to be irregular for vertical stimulation were largely responsible for this asymmetry. Second, geometry-based estimations are, to some extent, asymmetrical. Third, a cognitive effect corresponding to the evaluation of navigability for upward and downward turns was found (i.e.,top-down influences, such as the fear of falling often reported), which tended to increase the estimation of turns in the direction of gravity. 相似文献
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Jayme R. McReynolds Kyle Donowho Amin Abdi James L. McGaugh Benno Roozendaal Christa K. McIntyre 《Neurobiology of learning and memory》2010,93(3):312-321
Considerable evidence indicates that glucocorticoid hormones enhance the consolidation of memory for emotionally arousing events through interactions with the noradrenergic system of the basolateral complex of the amygdala (BLA). We previously reported that intra-BLA administration of a β-adrenoceptor agonist immediately after inhibitory avoidance training enhanced memory consolidation and increased hippocampal expression of the protein product of the immediate early gene activity-regulated cytoskeletal-associated protein (Arc). In the present experiments corticosterone (3 mg/kg, i.p.) was administered to male Sprague-Dawley rats immediately after inhibitory avoidance training to examine effects on long-term memory, amygdala norepinephrine levels, and hippocampal Arc expression. Corticosterone increased amygdala norepinephrine levels 15 min after inhibitory avoidance training, as assessed by in vivo microdialysis, and enhanced memory tested at 48 h. Corticosterone treatment also increased expression of Arc protein in hippocampal synaptic tissue. The elevation in BLA norepinephrine appears to participate in corticosterone-influenced modulation of hippocampal Arc expression as intra-BLA blockade of β-adrenoceptors with propranolol (0.5 μg/0.2 μL) attenuated the corticosterone-induced synaptic Arc expression in the hippocampus. These findings indicate that noradrenergic activity at BLA β-adrenoceptors is involved in corticosterone-induced enhancement of memory consolidation and expression of the synaptic-plasticity-related protein Arc in the hippocampus. 相似文献
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Rusty B McIntyre 《Journal of experimental social psychology》2003,39(1):83-90
Stereotype threat impairs performance in situations where a stereotype holds that one’s group will perform poorly. Two experiments investigated whether reminding women of other women’s achievements might alleviate women’s mathematics stereotype threat. In Experiment 1, college women performed significantly better on a difficult mathematics test when they were first told that women in general make better participants than men in psychology experiments. In Experiment 2, college women performed significantly better on a difficult mathematics test when they first read about four individual women who had succeeded in architecture, law, medicine, and invention. The results are seen as having implications for theories of stereotype threat, self-evaluation, and performance expectations. 相似文献
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Through individual-to-group generalisation, information about individual members of stigmatised social groups changes the outgroup judgment. This article reports meta-analytic reviews of over 30 years of experimental, lab-based research on individual-to-group generalisation (107 independent tests; 5393 participants). In a first meta-analysis, a positive, medium-size generalisation effect was detected (r = .28, p < .001), reflecting significant generalisation of outgroup exemplar information to the outgroup judgment. This effect was moderated by the number of exemplars and exemplar typicality, with more moderately atypical exemplars maximising generalisation effects. Several other design parameters—including type of control condition, generalisation measures, mode of information provision, type of target outgroup and origin of study—did not moderate the positive generalisation effect. A second meta-analysis investigated the interplay between metacognitions and generalisation and found assimilation effects with metacognitive triggers encouraging exemplar inclusion, and contrast effects with metacognitive cues encouraging exemplar exclusion. These results demonstrate that the same outgroup exemplar can lead to bias reduction or bias exacerbation, depending on available meta-cognitive cues. Findings are discussed in terms of implications for intergroup psychology, generalisation theory and bias reduction interventions. 相似文献