and how late-stage Alzheimer &apos;s patients , whose dementia was so far progressed that they could no longer recognize their family , could still pick out a tune by Chopin at the piano that they had learned when they were children .
en hoe vergevorderde Alzheimerpatiënten , wiens dementie zo ver gevorderd was dat ze niet langer hun familie herkenden , wel een pianomelodie van Chopin herkenden die ze hadden geleerd toen ze kinderen waren .