I thought I'd include additional references of theories about mechanisms of change for those interested. The emphasis, of course, should be on an interaction of both procedural and dual stimulation elements. I hope these will be helpful.
Additional materials and updates appear on the EMDR Institute website (www.emdr.com)
References
Andrade, J., Kavanagh, D., & Baddeley, A. (1997). Eye-movements and visual imagery: A working memory approach to the treatment of post-traumatic stress disorder. British Journal of Clinical Psychology, 36, 209-223.
Armstrong, M.S., & Vaughan, K. (1996). An orienting response model of eye movement desensitization. Journal of Behavior Therapy and Experimental Psychiatry, 27, 21-32
Boudewyns, P.A. & Hyer, L.A. (1996) Eye movement desensitization and reprocessing (EMDR) as treatment for post-traumatic stress disorder (PTSD). Clinical Psychology and Psychiatry, 3, 185-195.
Dyck, M.J. (1993). A proposal for a conditioning model of eye movement desensitization treatment for posttraumatic stress disorder. Journal of Behavior Therapy and Experimental Psychiatry, 24, 201-210.
Fensterheim, H. (1996). Eye movement desensitization and reprocessing with complex personality pathology: an integrative therapy. Journal of Psychotherapy Integration, 6, 27-38.
Hassard, A. (1996) Reverse learning and the psyiological basis of eye movement desensitization, Medical Hypotheses, 47, 277-282.
Levin, C., Shapiro, F., and Weakland, J. (1996) When the past is present: A conversation about EMDR and the MRI interactional approach. Published in M.F. Hoyt (Ed.). Constructive Therapies Two.
MacCulloch, M.J., & Feldman, M.P. (1996) Eye movement desensitisation treatment utilizes the positive visceral element of the investigatory reflex to inhibit the memories of post traumatic stress disorder: A theoretical analysis. British Journal of Psychiatry, 169, 571-579..
Shapiro, F. (1995). Eye movement desensitization and Reprocessing: Basic priniciples, protocols and procedures. New York: Guilford Press, pp. 309-323.