Figure 3.

Differences between MOB and AOB responses to SF stimulation were preserved in whole-cell recordings. A, B, Whole-cell recordings of the responses of MOB (A) and AOB (B) mitral cells to threshold stimuli. Subthreshold (black) and suprathreshold (green) responses are superimposed. The typical burst response of MOB cells was evident even for low-intensity stimulation. Note the voltage ramp underlying the MOB response. The baseline membrane potential is indicated for each trace. C, E, Responses of the MOB cell in A to just-suprathreshold (C) and high (E) stimulation levels, labeled as percentages of just-suprathreshold stimulus strength. Firing terminated abruptly well before the decline of the underlying voltage ramp. Spikes are trimmed at 0 mV. D, F, Responses of the AOB cell in B to just-suprathreshold (D) and higher (F) stimulation strengths. The responses changed from a transient response in D to sustained firing in F. Spikes are trimmed at 0 mV. G, PSTH of the responses in A, C, and E. The response duration remained relatively constant, contrasting with the highly dynamic range of the peak firing rate. H, PSTH of the responses in B, D, and F. The sustained response strengthened with increasing stimulus intensity. Note the different scales of y-axes between G and H.