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Interhemispheric differences of spectral power in expressive language: A MEG study with clinical applications

Fisher, AE; Furlong, PL; Seri, S; Adjamian, P; Witton, C; Baldeweg, T; Phillips, S; ... Thai, NJ; + view all (2008) Interhemispheric differences of spectral power in expressive language: A MEG study with clinical applications. INT J PSYCHOPHYSIOL , 68 (2) 111 - 122. 10.1016/j.ijpsycho.2007.12.005.

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Abstract

In the last decade we have seen an exponential growth of functional imaging studies investigating multiple aspects of language processing. These studies have sparked an interest in applying some of the paradigms to various clinically relevant questions, such as the identification of the cortical regions mediating language function in surgical candidates for refractory epilepsy. Here we present data from a group of adult control participants in order to investigate the potential of using frequency specific spectral power changes in MEG activation patterns to establish lateralisation of language function using expressive language tasks. In addition, we report on a paediatric patient whose language function was assessed before and after a left hemisphere amygdalo-hippocampectomy. Our verb generation task produced left hemisphere decreases in betaband power accompanied by right hemisphere increases in low beta-band power in the majority of the control group, a previously unreported phenomenon. This pattern of spectral power was also found in the patient's post-surgery data, though not her pre-surgery data. Comparison of pre and post-operative results also provided some evidence of reorganisation in language related cortex both inter- and intra-hemispherically following surgery. The differences were not limited to changes in localisation of language specific cortex but also changes in the spectral and temporal profile of frontal brain regions during verb generation. While further investigation is required to establish concordance with invasive measures, our data suggest that the methods described may serve as a reliable lateralisation marker for clinical assessment. Furthermore, our findings highlight the potential utility of MEG for the investigation of cortical language functioning in both healthy development and pathology. (C) 2008 Elsevier B.V. All rights reserved.

Type: Article
Title: Interhemispheric differences of spectral power in expressive language: A MEG study with clinical applications
DOI: 10.1016/j.ijpsycho.2007.12.005
Keywords: language lateralisation, verb generation, MEG, epilepsy, spectral power, TEMPORAL-LOBE EPILEPSY, INTRACAROTID AMOBARBITAL PROCEDURE, FUNCTIONAL MRI, PREADOLESCENT CHILDREN, BRAIN ACTIVATION, VERB GENERATION, LEFT-HEMISPHERE, WADA PROCEDURE, DOMINANCE, FMRI
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health > ICH Developmental Neurosciences Prog
URI: http://discovery.ucl.ac.uk/id/eprint/97596
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