Fig. 9.

Barrages of synaptic potentials and resulting action potentials are recorded in CA3 pyramidal cells coincident with extracellular minibursts. A, Representative whole-cell recordings (traces 1) and extracellular field recordings (traces 2) from hippocampal slices taken during TTX infusion. Selected events outlined by boxes are shown at a faster time base in Ba–Bd. Synaptic events (arrows) are shown at three different holding potentials in Bd–Bf. Recordings were made from slices of ventral hippocampus taken immediately after 2 weeks of TTX infusion of dorsal hippocampus. For this cell, the resting membrane potential was −65 mV, input resistance was 150 MΩ, the holding potential was −70 mV (A, Ba–Bd), and spike amplitude was 68 mV.