Figure 2. Learning and Memory Trials: the effect of exposure time, postexposure time, and their interaction on behavioral plasticity in S. diaprepesi (experimental design: Table 1; ANOVA and model diagnostics: Table 2).

Preference index (I_p) for α- pinene is constructed as the ratio of S. diaprepesi infective juveniles responding to α-pinene to those responding to blank arms in two choice olfactometers. Exposure is the amount of time in hours infective juveniles were kept in vials containing 1 μg/ml α-pinene. Postexposure is the amount of time in hours infective juveniles were kept in clean culture (i.e. plain water without additional chemical stimulus) after exposure and washing. (a) Preference index response surface. (b) Preference index contours.