Protracted vertex and frontal waves during drowsy states.
D001921:Brain / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D004594:Electrophysiology; D005071:Evoked Potentials; D005625:Frontal Lobe / Q000502:physiology*; D006801:Humans; D008606:Mental Processes