Fig. 2

Comparison of the field responses of grouped neurons. a–f Dose−response relationships of grouped ORNs that have distinct extracellular spike amplitudes. a Left: Spontaneous activity of ab2A (large spike) and ab2B (small spike). Middle: Average local field potential (LFP) responses of ab2A (blue traces) and ab2B (orange traces). Paired ORNs in the same sensilla were recorded in response to their respective private odorants at increasing concentrations. Right: Dose−response relationships of ab2A (blue) and ab2B neurons (orange) to methyl acetate and ethyl 3-hydroxy butyrate (top) or ethyl acetate and E3-hexenol, respectively (bottom). The absolute values of the peak LFP responses are shown. The highest and lowest concentrations of the “A” and “B” odorants are indicated logarithmically on the x-axis and aligned arbitrarily to facilitate comparison. b–f Additional sensillum types (ab3, ab4, pb1, ac3II and at4) were examined in a similar manner, as shown in a. g, h Average LFP responses and dose−response curves of grouped ORNs that exhibit similar extracellular spike amplitudes (g ab5; h ac3I). n = 9 pairs of ORNs, except for ac3: n = 6 pairs, mean ± s.e.m. Fit is with the Hill equation. Source data are provided as a Source Data file. ORN olfactory receptor neuron