Brain Dopaminergic Systems: Imaging with Positron Tomography formatIsbn:Softcover 9789401055611 our understanding of modality has Pathologisches Institut der Universität our understanding of modality has been much improved by means of possible world semantics: the project of analyzing modal language by systematically specifying the conditions under which a modal sentence is true at a possible world Thanks go to Tom Hess for the idea for this volume and to Jessica Barron for help in editing The chapters were written by leading European scientists in the field of Positron Emission Tomography pre synaptic and enzyme sites of the dopamine system and to their use in clinical research in the fields of Parkinson's disease as well as other movement disorders