There has always been a link between psychopathology and philosophy. Yet in recent years, critical appraisal of common points has been lacking. The continuing developments in individual sciences, however, have now created fertile ground for interdisciplinary dialogue. This dialogue, more necessary than ever, receives new impulse from this volume. Written by specialists from such different fields as psychiatry, psychology and philosophy, it contains papers on disturbed perception, disturbed cognition and disturbed self-perception.