Neuroimaging is a powerful and innovative tool for studying the pathol
ogy of psychiatric diseases and, more recently, for studying the drugs
used in their treatment. Technological advances in imaging have made
it possible to noninvasively extract information from the human brain
regarding a drug's mechanism and site of action. Until now, our unders
tanding of human brain pharmacology has depended primarily on indirect
assessments or models derived from animal studies. However, the adven
t of multiple techniques for human brain imaging allows researchers to
focus directly on human pharmacology and brain function. This review
outlines available neuroimaging techniques and examines how these vari
ous methods have already been applied to the drug development process,
as well as how they might be applied in the future.