State-of-the-Art Analysis of High-Frequency (Gamma Range) Electroencephalography in Humans

• DOI: 10.1159/000382023
• Publication Date: 2016-02-22T22:01:24Z
• Authors: Judith F. Nottage; Jamie Horder
• Keywords: Brain Mapping; Electromyography; 610; Brain; Electroencephalography; Artefacts; 03 medical and health sciences; 0302 clinical medicine; 616; Saccades; Muscle; Animals; Gamma Rhythm; Humans; Blinks; Muscle, Skeletal; Gamma oscillations

Gamma oscillations (>30 Hz) in the brain are involved attention, perception and memory. They altered various pathological states, as well by neuropharmaceuticals, so that they of interest drug clinical investigations. However, when human electroencephalogram is recorded on scalp, this neural high-frequency signal buried under a range other electrical signals such that, without careful handling, recordings cannot be considered reliable. The artefacts concern originate from: power line noise, saccade-associated contraction extra-ocular muscles, activity muscles face neck, screen refresh associated with blinking. Recent progress dealing these described, including either noise cancellation or phased template subtraction for regression independent component analysis correcting muscle mathematical modelling reducing neck activity. If properly addressed, gamma can uncovered.