NMDA and the group I mGluR agonist DHPG both elicit LTD of synaptic transmission at Schaffer collateral–CA1 synapses. A, Time course of LTD induced by bath-applied NMDA (10 μm, 3 min; filled bar), plotting normalized Schaffer collateral-evoked EPSC peak amplitudes recorded with whole-cell patch clamp from CA1 pyramidal cells (n = 6). B, Time course of LTD induced by bath-applied (S)-DHPG (25 μm, 5 min; filled bar), plotting normalized Schaffer collateral-evoked EPSC peak amplitudes recorded with whole-cell patch clamp from CA1 pyramidal cells (n = 6). Each point is mean ± SEM. EPSC peak amplitude is from n cells. Insets, Sample averaged evoked EPSCs (n = x) recorded at the times indicated by bars 1 and 2.