Figure 3.

A, Normalized firing rate of 16 feedforward cells. Thick gray dotted lines indicate the baseline firing rate and time of ejection. The averaged firing rate drops to ∼0 shortly after the ejection and then returns to baseline by 3 min. Thin black lines indicate SE. B, Example of a feedforward cell. The cell discharges reliably at a current below that necessary to produce a population spike. When the current was increased, the cell discharged earlier than the population spike. A failure is shown in gray. Calibration: 80 μV, 2 ms.