“Just as signs of memory loss may signal brain changes related to brain disease, apathy may indicate underlying changes,” said Lenore J. Launer, Ph.D, with the National Institute on Aging at the National Institutes of Health in Bethesda, MD, and a member of the American Academy of Neurology.
“Apathy symptoms are common in older people without dementia. And the fact that participants in our study had apathy without depression should turn our attention to how apathy alone could indicate brain disease.”
For the study, 4,354 people, with an average age of 76 and without dementia, underwent an magnetic resonance imaging (MRI) scan. They were also asked questions that measure apathy symptoms, which include lack of interest, lack of emotion, dropping activities, and interests, preferring to stay at home and having a lack of energy.
The researchers used brain volume as a measure of accelerated brain aging. “Brain volume losses occur during normal aging, but in this study, larger amounts of brain volume loss could indicate brain diseases,” the scientists explained.
The study found that people with two or more apathy symptoms had 1.4 percent smaller gray matter volume and 1.6 percent less white matter volume compared to those who had less than two symptoms of apathy. Excluding people with depression symptoms did not change the results, the researchers noted.
Gray matter is where learning takes place and memories are stored in the brain, the scientists explained. White matter acts as the “communication cables” that connect different parts of the brain.
“If these findings are confirmed, identifying people with apathy earlier may be one way to target an at-risk group,” Launer said.
The study, supported by the National Institutes of Health, the National Institute on Aging, the Icelandic Heart Association, and the Icelandic Parliament, was published in Neurology, the medical journal of the American Academy of Neurology
Source: American Academy of Neurology