Fig. 2.

Head entries during the 10 sec before CS onset, the 6 sec CS, and the 16 sec after CS offset. Food was delivered 3 sec after CS onset. The figure shows head entries for three representative rats, one in the vehicle group (top), one in SCH at 0.16 mg/kg (middle), and one in raclopride at 0.4 mg/kg (bottom). Horizontal bars indicate the presence of the rat's head in the food compartment during each of the 28 conditioning trials (with successive trials represented frombottom to top). Note the normal latencies to respond to food presentation in SCH- and RAC-treated rats.