Figure 4.

Correlation between intracellular activity of a superficial m-EC neuron and the laminar profile simultaneously recorded with a 16-channel silicon probe during 0.2–2 Hz LOT stimulation. A, Intracellular recording performed at different membrane potentials after intracellular injection of steady current. The activity recorded just out of the cell before intracellular penetration is illustrated on top (“out of cell”). The CSD profile is illustrated in the bottom part of the panel with the same time scale (surface on top). Superimposed traces of the FP laminar profile are illustrated in B (top) to enhance the correlation between intracellular signals, field potentials, and sink/sources. The time fragment outlined by the continuous line in A is expanded in B. The track determined by the silicon probe is shown between A and B, close to the CSD profile. rmp, Resting membrane potential. Current calibrations: A, B, from 0.3 to –0.3 mV/mm².