Too much brain inhibition triggers memory loss
While most people blame dying cells for a fading mind, the prefrontal cortex may actually be drowning in its own quietening signals.
The human brain maintains a constant tug of war between excitatory signals that spark activity and inhibitory signals that dampen it. For decades, researchers assumed that aging simply causes the brain to wear out or lose vital cells. However, new evidence suggests that cognitive decline is often driven by an oversupply of the brain's natural braking system. In the prefrontal cortex, the region responsible for complex thought, some individuals develop a high density of inhibitory synapses. These connection points act like a dimmer switch turned too low, suppressing the very signals needed for clear thinking.