Davis, C M Tension in the two frontales: electrode placement and artifact in the recording of forehead EMG. [electronic resource] - Psychophysiology Nov 1978 - 591-3 p. digital Publication Type: Journal Article ISSN: 0048-5772 Standard No.: 10.1111/j.1469-8986.1978.tb03117.x doi Subjects--Topical Terms: Action PotentialsBiofeedback, PsychologyElectroencephalography--methodsElectromyography--methodsForeheadHumansMuscle Tonus