Thinking activates EMG in scalp electrical recordings
| Autor: | Trent W. Lewis, Stephen Loveless, Marita Broberg, Emma M. Whitham, Angus Wallace, Kenneth J. Pope, Sean P. Fitzgibbon, John O. Willoughby, C. Richard Clark, Dylan DeLosAngeles |
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| Přispěvatelé: | Whitham, E M, Lewis, Tony, Pope, K J, Fitzgibbon, S P, Clark, C, Loveless, S, DeLosAngeles, D, Wallace, Angus Keith, Broberg, M, Willoughby, Scott |
| Rok vydání: | 2007 |
| Předmět: |
Adult
Male Elementary cognitive task medicine.medical_specialty Electromyography Electroencephalography Audiology behavioral disciplines and activities Thinking Rhythm Physiology (medical) medicine Humans Paralysis Muscle Skeletal Aged Scalp medicine.diagnostic_test Eye movement Brain Body movement Middle Aged Sensory Systems body regions Electrophysiology medicine.anatomical_structure Neurology Atracurium Neurology (clinical) Neuromuscular Blocking Agents Psychology Artifacts Neuroscience psychological phenomena and processes |
| Zdroj: | Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology. 119(5) |
| ISSN: | 1388-2457 |
| Popis: | Objective Fast electrical rhythms in the gamma range (30–100 Hz) in scalp (but not intracranial) recordings are predominantly due to electromyographic (EMG) activity. We hypothesized that increased EMG activity would be augmented by mental tasks in proportion to task difficulty and the requirement of these tasks for motor or visuo-motor output. Methods EEG was recorded in 98 subjects whilst performing cognitive tasks and analysed to generate power spectra. In four other subjects, neuromuscular blockade was achieved pharmacologically providing EMG-free spectra of EEG at rest and during mental tasks. Results In comparison to the paralysed condition, power of scalp electrical recordings in the gamma range varied in distribution, being maximal adjacent to cranial or cervical musculature. There were non-significant changes in mean gamma range activity due to mental tasks in paralysed subjects. In normal subjects, increases in scalp electrical activity were observed during tasks, without relationship to task difficulty, but with tasks involving limb- or eye-movement having higher power. Conclusions Electrical rhythms in the gamma frequency range recorded from the scalp are inducible by mental activity and are largely due to EMG un-related to cognitive effort. EMG varies with requirements for somatic or ocular movement more than task difficulty. Significance Severe restrictions exist on utilizing scalp recordings for high frequency EEG. |
| Databáze: | OpenAIRE |
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