Burst-induced long-term depression in ELL pyramidal cells. A , Normalized EPSP peak amplitude averages during control of only presynaptic burst stimulation (4 pulses at 100 Hz) (4-0; n = 2). B , EPSP averages before burst pairing (4 presynaptic and 4 postsynaptic stimulations; gray) and after pairing (black). C , Normalized EPSP peak amplitude averages during pairing protocol at a delay (Δt _B) of −25 ms (n = 5). Δt _B is defined as the time delay between first pulse of both presynaptic and postsynaptic stimulations. D , The effect of varying Δt _B. All time points are normalized EPSP amplitude averages of five to seven cells, except ±100 ms, which has n = 4. Error bars show the SD in A , C , and D .