Volume conduction and the 14 and 6/sec positive spike phenomenom.
D004569:Electroencephalography; D004594:Electrophysiology; D006624:Hippocampus / Q000502:physiology*; D006801:Humans; D009431:Neural Conduction / Q000502:physiology*; D009778:Occipital Lobe / Q000502:physiology*; D013702:Temporal Lobe / Q000502:physiology*