Figure 1.

Interconnections between two classes of inhibitory interneurons. (a) Slow IPSC evoked in a SR interneuron by SL-M stimulation. The slow IPSC was completely blocked by 40 μM bicuculline. Also shown is the averaged fast spontaneous IPSC from the same cell for comparison. Magnitudes are normalized for comparative purposes. (b) Suggested interneuronal circuitry in region CA1. Solid lines show established connections. Dashed lines show hypothetical connections. GABA_A,fast and GABA_A,slow cells are so-named because of the kinetics of their postsynaptic effects.