Brain-Aging

What Is Cognitive Reserve and How Do High Performers Build It? A Neuroscience Framework Cognitive reserve is the brain’s capacity to sustain function under neural stress by recruiting alternative networks when primary ones degrade. It is built cumulatively over a lifetime through education, occupational complexity, and cognitively demanding leisure — and measured structurally via cortical thickness, hippocampal volume, and white-matter integrity preserved into late life. ...

Mitochondrial Dysfunction in Neurons: How Cellular Energy Failure Drives Cognitive Decline Mitochondrial dysfunction in the brain is a progressive failure of neuronal ATP production — driven by electron transport chain Complex I and III impairment — that depletes the adult neural stem cell pool, collapses hippocampal neurogenesis, and produces a cognitive signature measurable in peripheral blood mononuclear cells through proton leak and ATP-production panels. The damage is not diffuse fatigue. It is architectural. ...