Bilateral distribution of the O wave.
D001143:Arousal / Q000502:physiology*; D001288:Attention / Q000502:physiology; D003265:Contingent Negative Variation; D004569:Electroencephalography; D004594:Electrophysiology; D005072:Evoked Potentials, Auditory; D005625:Frontal Lobe / Q000502:physiology; D006801:Humans; D009949:Orientation / Q000502:physiology*; D010296:Parietal Lobe / Q000502:physiology; D010897:Pitch Discrimination / Q000502:physiology; D012018:Reflex / Q000502:physiology*