Figure 1.

Characterization of the hippocampal oscillations induced by carbachol. A, Schematic representation of the recording. Field recording electrode filled with PSB (2% in 0.5 m NaCl) and patch electrode were lowered into CA3 pyramidal layer. B, Electrophysiological properties of the pyramidal neurons recorded. C, At the end of the patch recording, PSB was iontophoretically injected (10 μA) to localize the recording site. D–G, The pyramidal neurons fire at the peak of the field oscillation, with a mean phase of 347° (G, blue line). On average (G, red line), the five cells recorded fired near the peak of the field oscillations.