Today it is considered that psychiatry has evolved from the „fuzzy discussions” stage to the new era of the „biological psychiatry”, which is mainly characterized by an increased interest in establishing new biomarkers for the psychiatric disorders. This could be, in fact, the main role for the basic or fundamental research in the very complex field of psychiatry. In this way, as known, there are increased efforts now in the field of basic research for giving valuable biomarkers for the clinicians to work with. These biomarkers should have some fundamental characteristics such as increased specificity, reliability and objectivity.