High occipital beta (18-30 Hz) and low occipital alpha (8-13 Hz) oscillatory response to target visual stimuli in bipolar disorder reduce with chronic valproate use - Özerdem, Ayşegül; Güntekin, Bahar; Tunca, Zeliha; BAŞAR, EROL (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2008)