Effects of a Methanolic Extract and a Hyperforin-Enriched CO2 Extract of St. John's Wort (Hypericum perforatum) on Intracerebral Field Potentials in the Freely Moving Rat (Tele-Stereo-EEG) - Dimpfel, W; Schober, F; Mannel, M (Pharmacopsychiatry, 1998)