Figure 1.

Schematics of experimental regimen. (A) Innate preference test (left) using one odor, and relative innate preference test (right) using 2 odors. (B) The 3 types of learning experiment. Please note that in half of the cases, the sequence of training trials was as indicated, whereas in the other half, it was reversed (e.g., with regard to the left most column the “Empty” trial was run first, to be followed by a “Odor +” trial). This figure appears in color in the online version of Chemical Senses.