Tablework, I believe, is predicated on the idea that the person must be 'restored', 're-educated' i.e. their sensory appreciation must be brought up to scratch (means become reliable). Now, while I don't doubt that when this can be affected, there will be a tremendous increase in health & vitality, hence mental condition, I do doubt that this step is essential, that it is the ONLY WAY a person can return to a good condition.