Figure 1. Acquisition Curves for 32 Floral Odorants.

The ordinate represents the percentage of proboscis extensions (PER) to the training odorant. The abscissa indicates the training trials spaced over two days, three trials on day one and a fourth trial on day two. The numbers in brackets indicate the numbers of bees trained for each odorant. Odorants are listed alphabetically, for physico-chemical characteristics of odorants see Table 1.