Brain HealthSome Brains Resist Alzheimer's — Scientists Found Why at the Neuron Level
Why do some people with significant Alzheimer's pathology — amyloid plaques, tau tangles — stay mentally sharp while others decline? Researchers at Sunnybrook Research Institute recorded activity from over 8,500 individual neurons in Alzheimer's-model rats that had maintained cognitive function despite established disease. They found that resilient animals used fewer neurons and those neurons fired in more stable, consistent patterns during repeated stimulation. Critically, this effect was independent of amyloid levels, suggesting resilience isn't simply about having less plaque. Instead, it appears tied to how neural circuits are organized and how reliably they respond. These neuronal signatures could become biomarkers for cognitive resilience and, eventually, targets for interventions aimed at preserving brain function even in the presence of Alzheimer's pathology.
