期刊
NEUROPSYCHOBIOLOGY
卷 72, 期 3-4, 页码 219-228出版社
KARGER
DOI: 10.1159/000382023
关键词
Gamma oscillations; Artefacts; Muscle; Saccades; Blinks; Electromyography
资金
- National Institute for Health Research (Mental Health Biomedical Research Centre / Dementia Biomedical Research Unit) at South London and Maudsley NHS Foundation Trust and King's College London
Gamma oscillations (>30 Hz) in the brain are involved in attention, perception and memory. They are altered in various pathological states, as well as by neuropharmaceuticals, so that they are of interest in drug and clinical investigations. However, when the human electroencephalogram is recorded on the scalp, this neural high-frequency signal is buried under a range of other electrical signals such that, without careful handling, recordings of the high-frequency electroencephalogram cannot be considered reliable. The artefacts of concern originate from: power line noise, saccade-associated contraction of the extra-ocular muscles, activity of muscles in the scalp, face and neck, screen refresh artefacts and activity of the muscles associated with blinking. Recent progress in dealing with these artefacts is described, including either noise cancellation or phased noise template subtraction for power line noise, regression or independent component analysis for correcting extra-ocular muscle activity and mathematical modelling for reducing scalp, face and neck muscle activity. If the artefacts are properly addressed, the neural gamma signal can be uncovered. (C) 2016 S. Karger AG, Basel
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