QUOTE : The popular antidepressant Prozac, which acts by blocking the reuptake of serotonin and probably increasing its availability, has received wide attention; the notion that low serotonin levels might be correlated with a tendency towards violence has surfaced in the popular press. The problem is that it is not the absence or low amount of serotonin per se that "causes" a certain manifestation. Serotonin is part of an exceedingly complicated mechanism which operates at the level of molecules, synapses, local circuits and systems, and in which sociocultural factors, past and present, also intervene powerfully. A satisfactory explanation can arise only from a more comprehensive view of the entire process, in which the relevant variables of a specific problem, such as depression or social adaptability, are analyzed in detail.