Figure 3. Voltage dependence of membrane potential oscillations in a FS interneuron.

In a FS interneuron, positive current injection (300 pA) elicited action potential bursts interspersed with quiescent periods during which membrane potential oscillations were present (A). Enlargements in B show that these oscillations were absent at the resting membrane potential (−79 mV), but were present when the cell was depolarised by approximately 40 mV. C, in the same cell, oscillations appeared when the cell was depolarised by > 33 mV from baseline, and oscillation frequency depended on the level of depolarisation.