Fig. 3. (A) Average dose–response curves for quinine and sinigrin obtained during 5 s recordings from single s. chaetica. The average response to the electrolyte 0.01 mol l^–1 KCl is indicated as a reference. (B) Average temporal response patterns for KCl, quinine and two concentrations of sinigrin, counted in 0.5 s bins in 75 s. chaetica during 5 s recordings. Whereas 100 mmol l^–1 sinigrin elicited a high-response frequency very shortly after application, responses to 1 mmol l^–1 quinine were bursts of activity distributed over the whole 5 s recordings. Different letters indicate significant between-group differences. The dotted areas show tests within the first and the third time bin, respectively. Letters behind the captions in B indicate differences between the average spiking activity during 5 s (Scheffé tests after ANOVA, P<0.01).