The presence of physical markers associated with Alzheimer’s disease in the brain does not inevitably lead to the clinical manifestation of dementia, according to recent findings.
The Gap Between Pathology and Symptoms
Research indicates that some individuals possess what is described as an “Alzheimer’s brain”—meaning their brains show the characteristic biological changes of the disease—yet they do not exhibit the cognitive decline or memory loss typical of dementia. This suggests that the biological presence of the disease is not the sole determinant of whether a person will experience symptomatic impairment.
The Role of Brain Immune Cells
The factor that determines why some people remain cognitively healthy despite having the pathology of Alzheimer’s may be linked to the brain’s internal defense system. According to the research team, the immune cells within the brain may hold the key to this resilience, potentially influencing whether the disease progresses to a state of dementia or remains asymptomatic.
