Problem: You must outline one major topic of inquiry in psychopharmacology. This major topic is bipolar disorder. Present the primary research approaches employed to study these areas, as well as the main findings and interpretations of this research, must then be presented. In other words, tell me about six themes, what they are, how they are researched, and what we know about them. Please also discuss future study directions in this domain. You could, for example, explain me about alcoholism, what it is, how we have explored alcoholism within the field of psychopharmacology, and what we now know about likely causes, medications that treat alcoholism and why they work, and what the future may hold in this area.