title: Electromyographic investigation of procerus and frontalis muscles.
mesh_terms: D000200:Action Potentials; D000328:Adult; D004576:Electromyography; D004644:Emotions / Q000502:physiology; D005152:Facial Muscles / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement