I think you confirmed one part of my own theory bec, in that this could not work for those who are already ambidextrous, because you gained the chemical imbalance from PTSD after actually being ambidextrous. From the theory behind this, it could only work for someone who is not ambidextrous already, because ambidexterity causes a chemical imbalance, as does PTSD. The theory is that one cancels out the other, being that ambidexterity is taught after PTSD.

I have another theory to this yet, in that the person who has done this, hence the writing above, also continues to play the bango each day. Now CBT encompasses music therapy, because playing of musical instruments is a known relaxation technique taught to those who have PTSD, secondly, I am more curious to if the person who did this was to stop playing the bango for a few months, will the symptoms return.