Memory exists as a source of immeasurable joy and pleasure with loved ones and children and laughter and achievements parading across our conscious lives, even as it holds the repository of one of our greatest fears, that of its loss in dementia, alzheimer's and brain trauma. The very substance of who we define ourselves to be is constructed out of our memories, as they provide a seemingly unbroken chain of evidence that we are who we say we are. Take away our memories, show them to be anything less than an absolute source for our rationalized