| Frequency-dependent spatiotemporal distribution of cerebral oscillatory changes during silent reading: a magnetoencephalograhic group analysis. | |
| | |
MedLine Citation:
|
PMID: 20728551 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The frequency profiles and time courses of oscillatory changes when reading words are not fully understood, although there have been many reports that oscillatory dynamics reflect local brain function. In order to clarify oscillatory dynamics, we investigated the frequency and spatiotemporal distributions of neuromagnetic activities during silent reading of words in 23 healthy subjects. Individual data were divided into the following frequency bands: theta (5-8 Hz), alpha (8-13 Hz), beta (13-25 Hz), low gamma (25-50 Hz), and high gamma (50-100 Hz), and were analyzed by synthetic aperture magnetometry (SAM). The time window was consecutively moved in steps of 50 ms. Group analysis was performed to delineate common areas of brain activation. A transient power increase in the theta band occurred first in the bilateral occipital cortices, and then rapidly propagated to the left temporo-occipital areas, left inferior and middle frontal gyri, bilateral medial prefrontal cortices, and finally to the left anterior temporal cortices, which possibly reflects a serial cognitive process. This serial propagation of the transient power increase in the theta band was followed by sustained power decreases in the alpha, beta and low gamma bands. These results suggest that the transient power increase in the theta bands may be associated with priming and propagation of local activities, while sustained power decreases in the alpha, beta and low gamma bands reflect parallel neural processes related to silent reading words. Our results showed a relationship between frequency bands of oscillatory changes and locations. This may have implications in the relationship between frequency bands and functions. |
| | |
Authors:
|
Tetsu Goto; Masayuki Hirata; Yuka Umekawa; Takufumi Yanagisawa; Morris Shayne; Youichi Saitoh; Haruhiko Kishima; Shirou Yorifuji; Toshiki Yoshimine |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-19 |
Journal Detail:
|
Title: NeuroImage Volume: 54 ISSN: 1095-9572 ISO Abbreviation: Neuroimage Publication Date: 2011 Jan |
Date Detail:
|
Created Date: 2010-10-22 Completed Date: 2011-01-19 Revised Date: 2011-04-14 |
Medline Journal Info:
|
Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: United States |
Other Details:
|
Languages: eng Pagination: 560-7 Citation Subset: IM |
Copyright Information:
|
Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
|
Department of Neurosurgery, Osaka University Medical School, Suita, Osaka, Japan. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Brain / physiology* Brain Mapping / methods* Female Functional Laterality Humans Magnetoencephalography / methods* Male Neurophysiology / methods Reading* Reference Values Task Performance and Analysis Temporal Lobe / physiology Young Adult |
| Comments/Corrections | |
Erratum In:
|
Neuroimage. 2011 Apr 1;55(3):1407 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Investigating brain response to music: a comparison of different fMRI acquisition schemes.
Next Document: Trait approach and avoidance motivation: lateralized neural activity associated with executive funct...