Brooks, J.L. and Wong, Y. and Robertson, L.C. (2005) Crossing the midline: reducing attentional deficits via interhemispheric interactions. Neuropsychologia, 43 (4). pp. 572-582. ISSN 0028-3932.
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Patients with unilateral neglect and extinction show a profound lack of awareness of stimuli presented contralateral to their lesion. However, many processes of perception are intact and contralesional stimuli seem to reach a high level of representation, perceptual and semantic. Some of these processes can work to decrease the magnitude of the attentional deficit. Here, we examine two of these intact processes, feature detection and perceptual grouping. First, we demonstrate that feature detection occurs in parallel in the contralesional visual fields of neglect and extinction patients. Second, we attempt to dissociate the influence of perceptual contours across the vertical meridian from the presence of an object or higher-level perceptual unit (or group) that may be created by these contours. We find that connections across the midline affect attentional deficits independently of the objects they may create. This suggests that several effects of grouping on neglect and extinction may be mediated by long-range cortical interactions that arise from connections across the vertical meridian.
|Uncontrolled keywords:||Extinction; Neglect; Visual search; Grouping; Interhemispheric interactions; Colinearity; Interpolation; Continuation|
|Subjects:||B Philosophy. Psychology. Religion > BF Psychology|
|Divisions:||Faculties > Social Sciences > School of Psychology > Cognitive Psychology|
|Depositing User:||Joseph Brooks|
|Date Deposited:||21 Mar 2012 15:16|
|Last Modified:||31 Jul 2012 13:38|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/29190 (The current URI for this page, for reference purposes)|
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