Physiologic Monitoring of Antidepressant Response

Primary: to identify physiologic indicators of venlafaxine treatment response using quantitative EEG (QEEG) cordance, and to determine if cordance changes are specifically associated with response to venlafaxine; Secondary: to determine if cordance changes early in the course (i.e., prior to improvement in clinical symptoms) of venlafaxine (or another antidepressant if venlafaxine is not clinically indicated for a particular patient) are predictive of later clinical response.