A recent study suggests that brain size and shape may not be consistent across all individuals and could potentially serve as an indicator of early dementia signs. Researchers at the University of California conducted a study analyzing over 2,600 brain scans of adults ranging from 30 to 97 years old. They found that older adults experiencing cognitive decline exhibited distinctive “uneven shaping” in their brains, which could offer new insights into identifying dementia risk factors.
Lead author Niels Janssen highlighted that while previous studies focused on tissue loss in different brain regions with aging, their research revealed systematic shifts in the overall brain shape, closely linked to cognitive impairment. Dementia encompasses various conditions characterized by a decline in brain function, with Alzheimer’s disease being the most prevalent form, accounting for 60 to 70% of cases according to the World Health Organization.
The study observed that older adults with cognitive decline showed significant expansion in the inferior and anterior brain areas, while the superior and posterior regions displayed inward contraction. Notably, individuals with poorer reasoning skills exhibited more pronounced posterior compression, indicating pressure on the back regions of the brain. The study also highlighted the potential impact of age-related shape changes on the entorhinal cortex, a critical memory center in the brain.
Researchers suggested that these shape alterations could potentially push the entorhinal cortex closer to the skull’s base, where tau, a protein associated with Alzheimer’s disease, tends to accumulate. Co-author Dr. Michael Yassa explained that this shifting brain geometry might contribute to the vulnerability of the entorhinal cortex and the progression of Alzheimer’s disease.
Understanding these brain shape changes could offer new insights into Alzheimer’s disease mechanisms and early detection possibilities, according to Dr. Yassa. The study emphasizes the significance of unraveling how brain shape alterations may impact disease progression, particularly in the early stages of dementia onset.
Recognizing the importance of early diagnosis in managing dementia, the NHS advises individuals experiencing symptoms to seek medical guidance promptly. Early detection can help slow down disease progression in some cases, enabling individuals to maintain mental function for longer periods. A timely diagnosis also facilitates access to appropriate treatment and support services, aiding in future planning for individuals and their families.
For further information on dementia, visit the NHS website.