Well, if we leave our egos at the door for a moment. I can see that you are far more learned on the subject than me, and I commend you for that. I was wrong to get annoyed - I just assumed you were taking the stance that most 'professionals' take. Which dismisses the possibility of a neurological cause, my understanding is very similar to yours. I would describe this problem as 'neurological'. Which I wrongly assumed you were dismissing. Keep up your studying, and maybe you will be the one to finally crack it