Psychology is the art of healing disease of the mind, but also has more insidious uses in interrogation, brainwashing and torture.
This allows you to substitute your Medicine for the Seduction and Intimidation when dealing with people in a medical context, or when you otherwise have them in your power somehow.
Given time, you can do a very thorough interrogation, brainwash someone or inflict trauma and personality disorders. You can also cure such disorders and undo the work of another psychologist or other mental powers, like Influence.