Figure 2: Rules for cross-talk between odour-evoked responses in the antennal lobe.

(a) Percentage reduction in the peak spike synchrony between solitary versus overlapping introductions of the same odourant is shown (mean±s.e.m.; n=10 trials). The bars are shaded based on the significance of peak neural synchrony reduction (logarithms of their P values). (b) Percentage reduction in total spikes across neurons is shown for solitary versus overlapping introduction of the same odourant (area under black curve/area under red curve shown in Fig. 1f). Same colour convention as in a. (c) Regression analysis between spike-count reduction (x-axis; b) and reduction in peak synchrony (y-axis; a) did not reveal any significant relationship between variables (R²=0.11, P=0.37). (d) Percentage of neurons activated by solitary presentations of both odourants is shown (see Methods). Same colour convention as in a. (e) Regression analysis between response overlap as quantified by the percentage of co-activation (x-axis; d) and reduction in neural response synchrony (y-axis; a) revealed a significant linear relationship between the two variables (R²=0.82, P=7 × 10⁻⁴).