Hey Olga - Psychology is the study of behavior and some of that is controlled by the brain...We'd like to think it was all controlled by the brain but that's not really the case. This is already getting interesting.
This link, http://www.onetonline.org/find/quick?s=psychologist, will provide you with an overview of the different types of psychology jobs that are out there.
The field of psychopharmacology is study of the brain, chemical substances, and behavior. It's pretty interesting and a growing field with a lot opportunities.
A neuropsychologist is also a really interesting job. Check this out: http://www.onetonline.org/link/summary/19-3039.01.
Let me know what you think of these links and I'll be happy to answer more questions.