Fig. 1. Relevance of the extent of abdominal surgery on food-reinforced behavior. The mean (SEM) food pellets earned in the first 8 or 15 h of the postoperative period is shown after sham surgery (anesthesia only), incision of the skin only, incision of the skin and underlying musculature, or incision of the skin and musculature with exteriorization and manipulation of 10 cm of intestine (incision/gut). * Significantly different from sham surgery (  P < 0.05).