In the philosophy of psychiatry, there has been an ongoing dis-pute about the capabilities and limits of the bio-natural sciences as a source of methods and knowledge for quite some time now. Still, many problems remain unsolved. This is at least in part due to the regrettable fact that the opposing parties are far too rarely prepared to swap ideas and to try to increase their mutual under-standing. On the one hand there are those—psychiatrists as well as philosophers—who maintain a more mentalistic and/or phe-nomenalistic view of the psyche and its disturbances. On the other hand there are researchers who follow biologically inspired strate-gies: Since the human mind is something through and through biological, mental diseases, too, can and should be explained and treated biologically. Even though there are examples of fruit-ful collaboration, in general the split prevails. One often gets the impression that both sides remain in their “trenches”, busy