Fig. 1.

Schematic drawings of coronal sections of the rat brain showing the tip of injector placements from individual rats with accurate bilateral placements in the RMTg. Solid circles represent injector sites of animals that were under the voluntary ethanol drinking paradigm; blank triangles represent injector sites of animals that were under the voluntary sucrose drinking paradigm; blank circles represent injector sites of animals that were in operant self-administration of ethanol (adapted from (Paxinos and Watson, 2007).