“…This equipment serves the principal purpose of assessing anorectal sensory and motor function but, when dynamic pressure changes are fed back to the patient, for instance as a graphic display, the machine can help in training the perineal system (Hauri, 1975). Both faecal expulsion (encopresis) and retention (constipation) have been successfully modified by manometric biofeedback (Wald, Chandra, Gabel, & Chiponis, 1987;Weber, Ducrotte, Touchais, Roussignol, & Denis, 1987), the method being most suitable for primary or idiopathic disorders in which voluntary defaecation has never been achieved (Berman, Manning, & Harris, 1990;Loening-Baucke, 1990). These conditions are typified by an absence of underlying organic pathology.…”