Myoelectric Complex, Migrating: A pattern of gastrointestinal muscle contraction and depolarizing myoelectric activity that moves from the stomach to the ILEOCECAL VALVE at regular frequency during the interdigestive period. The complex and its accompanying motor activity periodically cleanse the bowel of interdigestive secretion and debris in preparation for the next meal.Motilin: A peptide of about 22-amino acids isolated from the DUODENUM. At low pH it inhibits gastric motor activity, whereas at high pH it has a stimulating effect.Gastrointestinal Motility: The motor activity of the GASTROINTESTINAL TRACT.Duodenum: The shortest and widest portion of the SMALL INTESTINE adjacent to the PYLORUS of the STOMACH. It is named for having the length equal to about the width of 12 fingers.Electromyography: Recording of the changes in electric potential of muscle by means of surface or needle electrodes.Jejunum: The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.Artificial Limbs: Prosthetic replacements for arms, legs, and parts thereof.AmputeesNeurofeedback: A technique to self-regulate brain activities provided as a feedback in order to better control or enhance one's own performance, control or function. This is done by trying to bring brain activities into a range associated with a desired brain function or status.Amputation Stumps: The part of a limb or tail following amputation that is proximal to the amputated section.Amputation: The removal of a limb or other appendage or outgrowth of the body. (Dorland, 28th ed)Electrical Equipment and Supplies: Apparatus and instruments that generate and operate with ELECTRICITY, and their electrical components.Arm: The superior part of the upper extremity between the SHOULDER and the ELBOW.Digestive System Physiological Phenomena: Properties and processes of the DIGESTIVE SYSTEM as a whole or of any of its parts.Ricinoleic Acids: Eighteen carbon fatty acids that comprise the great majority of CASTOR OIL, which is from the seed of RICINUS.Sphincter of Oddi: The sphincter of the hepatopancreatic ampulla within the duodenal papilla. The COMMON BILE DUCT and main pancreatic duct pass through this sphincter.Prosthesis Design: The plan and delineation of prostheses in general or a specific prosthesis.