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A, tetanic stimulation of WM resulted in LTD in WM-evoked PSPs, but not in GM-evoked PSPs, in a representative neuron. B, time courses (n = 6) of changes in amplitude of WM- (□) and GM-evoked (▪) PSPs. Depression of WM-evoked PSPs lasted for longer than 30 min. Photolysis by UV irradiation and tetanization were performed at the times indicated by the arrows.
