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31.
Hemisphere functioning and motor imitation in autistic persons 总被引:2,自引:0,他引:2
Previous research has found that a high proportion of autistic individuals exhibit an atypical pattern of hemispheric specialization suggestive of impaired left hemisphere functioning: namely, right hemisphere dominance for both verbal and visual-spatial processing. Studies of brain-damaged persons have suggested that the left hemisphere is specialized for the use of nonverbal gesture. Since a major characteristic of autism is an impairment in the use of gesture, it was predicted that autistic persons would also show atypical hemispheric specialization for motor imitation. To test this hypothesis, hemispheric activation was measured using EEG recordings of alpha rhythm in autistic and matched normal control subjects during four motor imitation tasks. Autistic subjects showed significantly greater right hemisphere activation during the imitation tasks, than normal subjects. This pattern was particularly evident in younger autistic subjects and during oral, rather than manual, imitation tasks. 相似文献
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In order to determine the robustness of the maximum-likelihood estimation procedure, random variates from six distributions were generated independently on a high speed computer and then used to represent the common and specific factors in a factor analysis model in which the coefficients of these factors had been specified. Using Lawley's approximatex
2 statistic in evaluating the estimates obtained, the estimation procedure is found to be insensitive to changes in the distributions considered.This study was conducted while the authors were members of the Statistical Laboratory at Iowa State University. All computations were done at Iowa State on an IBM 7074. 相似文献
34.
Selective attention enhances visual information processing, as measured by behavioral performance and neural activity. However,
little is known about its effects on subjective experience. Here, we investigated the effect of transient (exogenous) attention
on the appearance of visual motion, using a psychophysical procedure that directly measures appearance and controls for response
bias. Observers viewed pairs of moving dot patterns and reported the motion direction of the more coherent pattern. Directing
attention (via a peripheral precue) to a stimulus location increased its perceived coherence level and improved performance
on a direction discrimination task. In a control experiment, we ruled out response bias by lengthening the time interval between
the cue and the stimuli, so that the effect of transient attention could no longer be exerted. Our results are consistent
with those of neurophysiological studies showing that attention modulates motion processing and provide evidence of a subjective
perceptual correlate of attention, with a concomitant effect on performance. 相似文献
35.
Wu P Hoven CW Liu X Cohen P Fuller CJ Shaffer D 《Suicide & life-threatening behavior》2004,34(4):408-420
Using data from a community sample of youth ( N = 1,458; ages 9-17), this study assessed the association between adolescent substance use/abuse and suicidal behaviors. Suicide attempts were strongly associated with alcohol abuse and dependence, followed by frequent cigarette smoking. The associations remained significant even after controlling for depression. The associations between substance use/abuse and suicidal ideation were no longer significant after controlling for depression. These findings highlight the important role that substance use plays in adolescent suicidal behaviors. 相似文献
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Fuller RC 《Journal of the history of the behavioral sciences》2006,42(3):221-235
In just three generations, American psychology grew from a fledgling science to a culturally authoritative discipline. Standard accounts of psychology's meteoric rise typically omit what most needs to be illuminated: the resonance between psychological theory and the symbolic universe underlying America's popular religious imagination. This article sketches a cultural history of American psychology by examining how many of its core concepts invoke a metaphysical horizon associated with the nation's heritage of unchurched spirituality. 相似文献
39.
A closer look at the relationship between justice perceptions and union participation. 总被引:2,自引:0,他引:2
In this study, a series of nested models was tested to assess the extent to which the relationship between process-related justice and union participation is mediated by perceived union support and union commitment. Members of a steelworkers' local (N = 615) participated in the study. Fit indices most strongly supported a fully mediated model. Unlike previous research, process-related justice was operationalized as 2 distinct variables: procedural and interactional justice. Interactional justice was found to have a substantially stronger relationship with support perceptions than procedural justice. Results also indicated union support accounted for a greater amount of unique variance in union commitment than perceived union instrumentality. The results are discussed in relation to trust theory and the generalization of organization science across different types of organizations. 相似文献
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