Gastric secretion in the digestive phase Cephalic phase Mechanisms: Conditioned Unconditioned reflex Vagal efferent with Gastrin secretion through gastrin-releasing peptide (GRP) Experiment:Sham feeding by Pavlov Characteristics: Large quantity (30%) High acidity digestive powerGastric secretion in the digestive phase Cephalic phase Mechanisms: Conditioned & Unconditioned reflex Vagal efferent & with Gastrin secretion through gastrin-releasing peptide (GRP) Experiment: Sham feeding by Pavlov Characteristics: Large quantity (30%) High acidity & digestive power