00:00Scientists found immature brain cells in people over 80, raising new questions about Alzheimer's.
00:05Some people remain mentally sharp even when their brains show signs of the disease.
00:10Researchers examined donated brain tissue from healthy older adults, people with Alzheimer's
00:15dementia, and people who remained cognitively healthy despite Alzheimer's-related changes.
00:21Immature neurons appeared in all three groups.
00:23But the biggest clue wasn't simply how many cells were present.
00:26It was how they behaved.
00:28In cognitively resilient people, these cells showed biological activity associated with
00:34survival, alongside lower signals linked to inflammation and cell death.
00:38Researchers believe the cells may help support surrounding brain tissue rather than merely
00:43replace damaged neurons.
00:45There's an important caveat.
00:46The study cannot prove that these cells prevent dementia or establish that new neurons are
00:52continually produced in older human brains.
00:54The next step is to investigate how these cells interact with their neighbors.
00:59Understanding those interactions could eventually help scientists find new ways to preserve memory
01:04during aging.
01:05Disclosure.
01:05This video contains stock footage and content created or enhanced using AI-assisted tools.
