Researchers at Stanford University are conducting a neuroimaging study studying the effects of the hormone cortisol on brain functioning. Study participants will have a functional MRI and several tests of emotional reactions and hormone reactions to mild stress. Researchers at Stanford University are conducting a neuroimaging study studying the effects of the hormone cortisol on brain functioning. Study participants will have a functional MRI and several tests of emotional reactions and hormone reactions to mild stress. Participation is confidential. All study-related costs are covered by Stanford University. Participants who complete the study will be compensated $20/hr. If you are experiencing symptoms of depression, are not currently taking antidepressant medication, and between the ages of 21-55, you may be eligible for the study. Please leave us your contact information using this form to have us call you: https://redcap.stanford.edu/surveys/?s=3F7WCENPND