Abstract
In an effort to find quantitative markers of attention during reading, we performed simultaneous MEG and intracranial EEG recordings of alpha, beta and gamma band oscillatory activity in an epileptic patient during attentive vs. inattentive reading. We compared the strength and spatial organization of those oscillations between the two conditions. Time-frequency analysis of intracranial EEG revealed an attention-dependant network of gamma band energy increases and alpha/beta energy suppressions in response to word presentation. MEG data were also characterized by power increases in the gamma band and power suppressions in the alpha/beta range, mirroring the intracranial effects. The agreement we found between MEG and intracranial EEG power modulations suggests that MEG can detect attention-related modulations of cortical oscillatory processes and thus provide a reliable non-invasive measure of attention during reading in individual subjects.
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