Fascinatingly, brain areas participating in "default states" in young adults also exhibit early abnormalities seen in the elderly with Alzheimer's Disease (AD).XIV The explanation is unknown, but it might have to do with wear and tear on the brain from too much default activity, or we might be training inattention, or maybe it has to do with the unpleasant impacts of virtually continually revisiting the past. As with physical inactivity for the body, we do know that inattention is unhealthy for the brain. Furthermore linked to an unhealthy brain and a lifetime risk of AD seems to be leisure activities when we pay no attention mostly watching television. Those who have less than average diversity in leisure activities, spend less time on them, and practice more passive leisure activities mostly TV were nearly four times more likely to develop dementia over 40-year follow-up, according to one of several studies.fifteen sixteen Among leisure pursuits, reading, playing boar...