Abstr Abstract actIn this scholarly paper the authors, who are experienced clinicians and researchers, focus on the mechanisms of change in the arts-based and altered state of consciousness based psychotherapy methods. First, a theoretical conceptualization of the artsbased therapy methods' potential to introduce positive change is presented. The effectiveness of the arts-based psychotherapy methods is considered. Here the development of preverbal, implicit processing tools, especially in work with traumatized clients, is highlighted. Secondly, the clinical usefulness of these methods is reflected in written statements given by five traumatized clients. These statements concern which part of the therapeutic process the clients considered most beneficial. One of the statements has previously been published. It is finally discussed how the arts in psychotherapy can enhance clients' self-soothing capacities, and change capability. This is considered achieved through the activation of intersubjectivity and the innate human ability to express and experience creativity, including beauty and awe. This, together with flow experiences in line with positive psychology may offer a creative space of play where a new reality may be constructed and shared. The conclusion is drawn that the potentially effective mechanisms in the arts-based psychotherapies ought to be further investigated through both objective and subjective lenses in clinical work and research processes.List of abbreviations: ASC altered state of consciousness; AT art therapy; BMGIM Bonny Method of Guided Imagery and Music; CBT cognitive behavioral therapy; DMN default mode network; EMDR eye movement desensitization and reprocessing; GrpMI group music and imagery; MT music therapy; PDT psychodynamic psychotherapy; PTSD posttraumatic stress disorder; RCT randomized controlled trial; RMT receptive music therapy; WoT Window of Tolerance.An Arts An Arts-b -ba ased P sed Ps sy ychother chotherap apy P y Par aradigm adigmThe mechanisms of change in arts-based psychotherapy that we propose in this article are hypothetical, due to the current relatively low level of evidence for the arts and ASC-based therapies. How aesthetics and the arts can play a part in effective mental health practices, is an emerging field (Backos, 2018). Despite this, substantial clinical research is still lacking. There is a need for in depth studies of the mechanisms for change in the arts-based psychotherapies (Haeyen, 2018;Samaritter, 2018). In lieu of such studies, we can at least begin to sketch a theory-based evaluation of these methods (Gerge, 2018a). Several of the agents for potential change in these interventions can be generalized to other types of treatments as well, including PDT and CBT, and can be measured. Clients`evaluations of change mechanisms might be better predictors of outcome than the corresponding therapists`evaluations (Mander, Wittorf, & Schlarb et al., 2012). Change capability in psychotherapy is considered consisting of a) resource activation, b) problem actualiza...