Other categories referring to Hilar stimulation has been used to elicit (pharmacologically isolated) IPSPs in CA3 pyramidal neurons (recorded by means of intracellular or whole cell methods depending on the age of the animal). Paired pulse stimulation in this preparation resulted in paired pulse depression, which could be reduced by bath application of CGP35348 (a GABA(B)R antagonist) in adult rats. Neonatal rats (5-7 days old) showed paired pulse depression only within a much shorter range of interstimulus intervals and it was not affected by CGP35348 unless transmitter release was facilitated by raising the bath [Ca2+] and lowering the bath [Mg+]
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