Extracellular traces were collected from the subicular area of four different miniature slices. A, subicular SRFPs were reversibly blocked by a high-Mg2+ ACSF (6 mm). B–D, bicuculline (10 μm), CNQX (10 μm) or AP5 (100 μm), respectively, was applied for 6–8 min, and traces were collected before and at the end of drug application.