To evaluate the effects of the nicotinic allosteric modulator JNJ-39393406 on psychometric performance and residual depressive symptoms in patients who have been diagnosed with unipolar and bipolar depression but currently DO NOT meet criteria for an episode of Major Depression or Manic Episode.~Hypothesis: Allosteric modulation of the a7nAChR with JNJ-39393406 improves psychometric performance and residual depressive symptoms in patients with unipolar major depression disorder (MDD) or bipolar depression (BPD).~Outcome measurements:~BACS~MADRS~BNSS~CGI-S- BP,~Questionnaire on smoking urges (QSU) and time to the first cigarette after waking up in the morning,~Readiness for discharge scale.
To evaluate the effects of the nicotinic allosteric modulator JNJ-39393406 on psychometric performance and residual depressive symptoms in patients who have been diagnosed with unipolar and bipolar depression but currently DO NOT meet criteria for an episode of Major Depression or Manic Episode.