“
Those neurons, the brain’s soldiers, march for years, from the time we’re born, through the byways of the brain, setting actions into motion, rolling away boulders of all kinds, and then, with Alzheimer’s, they’re blocked by trees down at one end of the road, dangling wires at another. Over the years, the brain’s soldiers—this well-trained and reliable army, which has done so much, on so many different terrains, gone high and low, swum, climbed, strolled, and marched to all the different destinations of the mind—begin to falter, long before outsiders can see the troubles. Eventually (five years on for some, three for others, ten for some), the obstacles cannot be overcome. Messages cannot be received.
”
”