Fig. 5. Acquisition, extinction and facilitated extinction of CRs in moths receiving different treatments during the extinction phase. (A) Acquisition and extinction in moths receiving different extinction treatments. No significant between-group differences were found, indicated by the letters NS (Mann–Whitney tests, P>0.05). (B) Extinction curves for moths that have learned the CS. Only moths showing CR at the first extinction test were included. Pairing of linalool with quinine or sinigrin induced a more rapidly decreasing number of responses than the control. Different letters indicate significant between-group differences (Mann–Whitney tests, P<0.05).