Spatial and Frequency Differences of Neuromagnetic Activities Between the Perception of Open- and Closed-class Words |
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Authors: | Yingying Wang Jing Xiang Rupesh Kotecha Jennifer Vannest Yinhong Liu Douglas Rose Mark Schapiro Ton Degrauw |
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Institution: | (1) MEG Center, Division of Neurology, Cincinnati Children’s Hospital Medical Center, MLC 2015, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA;(2) Department of Neurology, Beijing Hospital, Ministry of Health, 1 Dahua Road, Beijing, 100730, China |
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Abstract: | The present study investigated the spatial and frequency differences of neuromagnetic activities between the perception of
open- and closed-class words by using a 275-channel whole head magnetoencephalography (MEG) system. Two groups of words, 110
open-class and 110 closed-class, were presented visually and auditorily simultaneously. The data of 12 healthy subjects were
analyzed with synthetic aperture magnetometry (SAM) which can identify the frequency-dependent volumetric distribution of
evoked magnetic fields (EMFs). Both vocabulary classes elicited spectral power changes in the left inferior frontal gyrus
(Broca’s area) and left posterior-superior temporal gyrus (Wernicke’s area) within 70–120 Hz. However, the open-class words
elicited event-related desynchronization (ERD) while the closed-class words elicited event-related synchronization (ERS) in
the two areas within 70–120 Hz. In addition, the open-class words also elicited ERS in the right inferior frontal gyrus, right
middle frontal gyrus and right inferior parietal lobe within 1–8 Hz, but the closed-class words only elicited ERD in the right
inferior frontal gyrus within 1–8 Hz. Furthermore, there were ERD in the right posterior-superior temporal gyrus within 120–200 Hz
for the open-class words, but not for the closed-class words. These results indicate that open- and closed-class words are
processed differently in the brain, not only in the anatomical substrates, but also in the frequency range of neuromagnetic
activity. |
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Keywords: | Magnetoencephalography Synthetic aperture magnetometry Open-class words Closed-class words Event-related desynchronization Event-related synchronization |
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