Thinking activates EMG in scalp electrical recordings.

摘要: Abstract Objective Fast electrical rhythms in the gamma range (30–100 Hz) scalp (but not intracranial) recordings are predominantly due to electromyographic (EMG) activity. We hypothesized that increased EMG activity would be augmented by mental tasks proportion task difficulty and requirement of these for motor or visuo-motor output. Methods EEG was recorded 98 subjects whilst performing cognitive analysed generate power spectra. In four other subjects, neuromuscular blockade achieved pharmacologically providing EMG-free spectra at rest during tasks. Results comparison paralysed condition, varied distribution, being maximal adjacent cranial cervical musculature. There were non-significant changes mean subjects. normal increases observed tasks, without relationship difficulty, but with involving limb- eye-movement having higher power. Conclusions Electrical frequency from inducible largely un-related effort. varies requirements somatic ocular movement more than difficulty. Significance Severe restrictions exist on utilizing high EEG.