Amygdala/physiology; Brain/physiology; Drinking/physiology; Eating/physiology; Receptors, Serotonin, 5-HT1/metabolism; Receptors, Serotonin, 5-HT2/metabolism; Acrylamides/administration & dosage; Acrylamides/pharmacology; Amygdala/drug effects; Analysis of Variance; Animals; Brain/drug effects; Catheterization; Columbidae; Dose-Response Relationship, Drug; Drinking/drug effects; Eating/drug effects; Indoles/administration & dosage; Indoles/pharmacology; Male; Metergoline/administration & dosage; Metergoline/pharmacology; Receptor, Serotonin, 5-HT1B/metabolism; Receptor, Serotonin, 5-HT1D/metabolism; Serotonin 5-HT1 Receptor Agonists; Serotonin 5-HT1 Receptor Antagonists; Serotonin 5-HT2 Receptor Antagonists; Serotonin Antagonists/administration & dosage; Serotonin Antagonists/pharmacology; Serotonin Receptor Agonists/administration & dosage; Serotonin Receptor Agonists/pharmacology; Time Factors