Original ArticlesIntensive Short-Term Dynamic Psychotherapy Trial Therapy Effectiveness and Role of “Unlocking the Unconscious”Abbass, Allan MD, FRCPC*; Town, Joel DClinPsy*; Ogrodniczuk, John PhD†; Joffres, Michel MD, PhD‡; Lilliengren, Peter PhD§Author Information *Department of Psychiatry, Dalhousie University, Halifax; †Department of Psychiatry, University of British Columbia; ‡Faculty of Health Sciences, Simon Fraser University, Vancouver, Canada; and §Department of Psychology, Stockholm University, Sweden. Send reprint requests to Allan Abbass, MD, FRCPC, Department of Psychiatry, Dalhousie University, Room 7507, 5909 Veterans Memorial Lane, Halifax, NS, Canada B3H 2E2. E-mail: firstname.lastname@example.org. The Journal of Nervous and Mental Disease: June 2017 - Volume 205 - Issue 6 - p 453-457 doi: 10.1097/NMD.0000000000000684 Buy Metrics Abstract This study examined the effects of trial therapy interviews using intensive short-term dynamic psychotherapy with 500 mixed sample, tertiary center patients. Furthermore, we investigated whether the effect of trial therapy was larger for patients who had a major unlocking of the unconscious during the interview compared with those who did not. Outcome measures were the Brief Symptom Inventory (BSI) and the Inventory of Interpersonal Problems (IIP), measured at baseline and at 1-month follow-up. Significant outcome effects were observed for both the BSI and the IIP with small to moderate preeffect/posteffect sizes, Cohen's d = 0.52 and 0.23, respectively. Treatment effects were greater in patients who had a major unlocking of the unconscious compared with those who did not. The trial therapy interview appears to be beneficial, and its effects may relate to certain therapeutic processes. Further controlled research is warranted. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.