Effect of a Depressive Illness on M.P.I. Scores

The Maudsley Personality Inventory (M.P.I.) is now established as one of the most widely used personality tests in the investigation of a variety of clinical, psychosomatic and genetical problems. When the M.P.I. is employed for such purposes it is most important to know how constant are the scores and how much they are altered by the changes in mental state which often occur in psychiatric patients over a period of days or weeks.