Dementia

A City's Power Grid Failing Sector by Sector

Imagine a city where power lines (neurons) carry electricity (neurotransmitters) between neighborhoods (brain regions) through underground junctions (synapses). Normally, power flows smoothly and each neighborhood stays lit and functional. In Alzheimer dementia, toxic sludge (amyloid-beta and tau proteins) clogs the underground junctions and corrodes the power lines from the inside, starting in the memory district (hippocampus) and spreading outward. As lines die, neighborhoods lose power one by one: first the memory district goes dark (you forget yesterday), then the planning district (you cannot organize), then the language district (you cannot speak), then the navigation district (you get lost in your own home). Unlike a city that can rebuild, once a power line is dead, it stays dead — the brain cannot make new neurons. Families install backup generators (routines, written lists, reminders) that mask the problem for a while, but when the damage spreads too far, no workaround helps anymore and the whole system collapses. The key insight: it is not that the person is trying to forget or being stubborn — entire networks are physically gone.