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Neural correlates of emotion-attention interactions: from perception, learning, and memory to social cognition, individual differences, and training interventions
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Second-language proficiency modulates the brain language control network in bilingual translators: An event-related fMRI study
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Language Control and Lexical Competition in Bilinguals: An Event-Related fMRI Study
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Opposite ERP effects for conscious and unconscious semantic processing under continuous flash suppression
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Semantic relatedness and first-second language effects in the bilingual brain: a brain mapping study
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Dissociation between goal-directed and discrete response localization in a patient with bilateral cortical blindness
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On the origin of the N400 effects: An ERP waveform and source localization analysis in three matching tasks
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Language Control and Lexical Competition in Bilinguals: An Event-Related fMRI Study
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Language control and lexical competition in bilinguals: An event-related fMRI study
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Language Control and Lexical Competition in Bilinguals: An Event-Related fMRI Study
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Language selection in bilinguals: A spatio-temporal analysis of electric brain activity
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The time course of semantic category processing in the cerebral hemispheres: an electrophysiological study
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Abstract:
Using visual half-field presentations of words to the right (RVF) and to the left visual field (LVF), this study investigated the time course of the hemispheric involvement in the processing of semantic category information. Multi-channel event related brain potentials (ERPs) were recorded from 15 healthy subjects during a categorisation task of sequentially presented word pairs. Subjects had to judge mentally after the appearance of the second word whether the words of a pair were semantically related (SR) or not (SU). ERPs were computed, from 100 ms before the onset of the second word to 600 ms, for SR and SU conditions in the LVF and in the RVF separately. The temporal segmentation of ERP map series into sequences of quasi-stable map configurations revealed a total of seven segments in each visual field of which only the first five (S1-S5, appearing between 70 and 400 ms) showed different map configurations as a function of visual field but presented a similar temporal sequence in both visual fields. By contrast, of the last two segments (S6 and S7) which appeared between similar to 400 and similar to 600 ms, only S7 differentiated SR and SU conditions in terms of its duration. Source localisation analysis of the segments: showed that following the initial activation of posterior brain regions as a function of the visual field of presentation, a common neural network was activated in the left hemisphere (LH) although the dynamics of activation varied as a function of visual field. Concerning the role of the right hemisphere (RH) in lexico-semantic processing, the results presented here appear to be compatible with a 'callosal relay model' and suggest that, in healthy subjects. information is transferred rapidly (similar to 150 ms) from the RH to the language dominant-LH. (C) 2001 Elsevier Science B.V. All rights reserved.
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Keyword:
Attention; Brain Potentials; Event-Related Potentials; Functional Mri; Language; Lexical Decision; Resolution Electromagnetic Tomography; Task; Visual Information; Words
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URL: https://espace.library.uq.edu.au/view/UQ:7f0bf12
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Spatio-temporal analysis of electric brain activity during semantic and phonological word processing
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Spatio-temporal analysis of electric brain activity during semantic and phonological word processing
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