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111.
The posterior parietal cortex (PPC) has been associated with the encoding of events in peripersonal space, but little is known about the precise segregation of parietal areas involved specifically in ‘near‐space’ visuospatial processing. This study applied transcranial magnetic stimulation (TMS) to two parietal areas: the right angular gyrus (ANG) and the right supramarginal gyrus (SMG) in addition to a control site, cortical visual area V5, while subjects performed symmetry judgements on lines presented simultaneously in the left and right visual fields. Eight subjects performed the task with the stimuli presented either in peripersonal or extra personal space. As expected, TMS over the right ANG caused subjects to report lines as being longer ipsilateral to the stimulation site, but only in near space. TMS of the right SMG, however, induced a bias shift in both near and far space, but the change only reached significance in near space. Our findings suggest that, consistent with its role in somatosensory functions, the SMG, like the ANG, is specialised for near space. 相似文献
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Individual differences in cortical anatomy are readily observable, but their functional significance for behaviors such as reading is not well understood. Here, we report a case of an apparent compensated dyslexic who had attained high achievement in visuospatial mathematics. Data from a detailed background interview, psychometric testing, divided visual field tasks measuring basic word recognition (word naming, nonword naming, and lexical decision), and more controlled word retrieval (verb, category, and rhyme generation), and measurements of his atypical brain structure are described. The findings suggested that enhanced "top-down" processing could provide the means to compensate for deficient "bottom-up" word decoding skills in this case. Relative to controls, this individual also evidenced unusually large asymmetries on several divided visual field lexical tasks, an extreme leftward asymmetry of the planum temporale, and a rare form of Sylvian fissure morphology (Steinmetz type 4, [Steinmetz, H., Ebeling, U., Huang, Y., & Kahn, T. (1990). Sulcus topography of the parietal opercular region: An anatomic and MR study. Brain and Language, 38, 515-533.]). We suggest that certain forms of brain organization may be associated with successful behavioral compensation for dyslexia, and that anatomical variations in the right hemisphere may be important contributors to individual differences in reading acquisition and achievement. 相似文献
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Heldt E Gus Manfro G Kipper L Blaya C Isolan L Otto MW 《Behaviour research and therapy》2006,44(5):657-665
Non-response to pharmacotherapy for panic disorder (PD) is a well-documented problem. However, little information exists to guide next-step strategies for these non-responders. In addition to pharmacologic augmentation strategies, several studies support the efficacy of cognitive-behavior therapy (CBT) for these patients, although data on long-term outcomes has been lacking. In this study, we provide one-year outcomes on a sample of 63 patients who completed group CBT for PD after failing to respond adequately to previous pharmacotherapy. Sustained significant benefit was found for all dimensional outcome scores, and nearly two-thirds of the sample met remission criteria. This occurred with reductions in medication use over the follow-up period. Negative predictors of remission status included comorbid dysthymia, social phobia, and generalized anxiety disorder. These results provide additional evidence for the efficacy of CBT for medication non-responders with PD. 相似文献