[stinos]

enough people suffer similar brain damage

Problem is that is quite hard to assess if it is sufficiently similar. That alone warrants an entire range of experiments. Also I don't know the literature enough to figure out if certain types of trauma reliably lead to similar experiences but I do think that is the case. For example electrical stimulation (not 'damage' per se but definitely altering the normal brain operation in subjects) has been repeatedly used to treat a myriad of problems like tinitus, tremors, ... And I know for a fact that during surgery, when attempting to find the right position for the electorde, it is not uncommon for patients to experience hallucinations/strong feelings of disgust/... because stimulating in the 'wrong' area instead of the proper target area. Also look at lobotomy for instance: quite a lot of similar symptoms in the unlucky subjects. Again: doesn't really prove filtration, but does indicate what you think doesn't happen (ie.strategical damage causing similar experiences) does in fact happen so it's imo not a good measure to reject the hypothesis.