High voltage 14 Hz hippocampal discharges on stereotactic EEG underlying 14&6 Hz positive bursts on scalp EEG

14&6 Hz positive bursts are one of the well-known benign EEG variants (Lombroso et al., 1966). They are maximally expressed in adolescents. The peak age of prominent 14&6 Hz ranges from 13 to 15 years. Gibbs and Gibbs (Gibbs and Gibbs, 1951) first reported 14&6 Hz positive bursts and indicated thalamic or hypothalamic epilepsy. However, currently they are believed to be a benign EEG variant because they are frequently seen in a wide range of neurological disorders including epilepsy and normal individuals (Lombroso et al., 1966).

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