Figure 1.

Olfactory habituation/dishabituation setup. For a slant-top cage lid (left), insert the applicator through the water bottle hole. For a flat-top cage lid (right), insert the applicator through a hole on the grid cage lid and use a small weigh boat to stabilize the applicator. In either case, always insert the wood end first through the hole. The depth of insertion is approximately 4 cm (Wrenn et al., 2004; Crawley et al., 2007).