Objective The field of psychotherapy is growing and is offering more and more types of treatments. The objective of this paper is to go through many clinical researches and experiences from psychotherapists with several psychotherapies in universities in Montreal and Lausanne, especially in the Institute for Mental Diseases in Montreal (IUSMM). Method Research and clinical evaluations have varied over many years. Many studies and results have been evaluated and discussed over those years. Clinical developments like APAP have been developed and evaluated in various milieus and applications. Various strategies have been proposed like APAP that can be added to many orientations of psychotherapies. APAP is called for Augmentation de la Psychothérapie par Amorçage Préconscient in French or "Psychotherapy Augmentation through Preconscious Priming" in English. Results Many various researches focusing psychotherapies were developed over long periods because psychotherapists were also clinicians and teachers. For example, we were able de proceed with clinical evaluations and many volunteer patients. We were able to demonstrate that preconscious listening was useful to facilitate cognitive change. Conclusion Research on psychotherapy remains difficult and require usually long periods. For example, the research APAP described here took much more than one year. Research remains also difficult because double blind procedures in research on psychotherapy are rare. We were lucky because preconscious listening was out of conscious listening creating a sort of placebo that was to be compared to the listening of personalized preconscious stimuli.