Abstract
In rats under urethane, ionotophoretic applications of GABA (30–60 nA) in the str. pyramide of CA1, showed a rapidly fading inhibitory effect. By contrast, GABA had a well-maintained inhibitory effect in str. radiatum. During iontophoresis of nipecotic acid (30–85 nA) identical applications of GABA in str. pyramidale caused a more prominent depression without fading, which suggests that removal of GABA, by uptake, can at least in part account for ‘fading. Nipecotic acid also prolonged the paired-pulse inhibition, presumably by prolonging the duration of inhibitory postsynaptic potentials.
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