Fig. 3. Effect of a proboscis extension conditioning procedure on the orientation towards linalool. (A) Mean duration ±S.D. (seconds) of the total flight and of the flight around the odour source. (B) Percentages of bees exhibiting orientated flights (up-wind zig-zag flight) and circling behaviour. Asterisks indicate significant differences: ^*P<0.05; ^**P<0.01; ^***P<0.001; NS, not significant.