A brain signal tracks slowing on an attention task in adults
In 276 neurotypical adults tested about five years apart, a nonrhythmic brain signal tracked slowing on an attention task but not changes in response control.
Limit: The attention association lacked confirmation in the held-out validation group
Edited by Boris Djordjevic · AgingResearch.News
A longitudinal observational study followed 276 adults of both sexes described as neurotypical, meaning they had typical brain function. Researchers tested them twice about five years apart. They recorded electrical activity from the scalp and measured its nonrhythmic component, rather than repeating waves. Participants completed tasks testing sustained attention—the ability to stay focused—and executive function, which helps control responses.
The measure of nonrhythmic activity declined within individuals, regardless of their age at the first session. This decline tracked slower responses on the attention task but was not associated with changes on the executive function task. The attention link appeared in recordings taken before cognitive testing, not afterward.
Why it matters
Tracking cognitive aging requires knowing which abilities a brain measure reflects. The researchers proposed this signal as a potential marker specific to attentional aging, rather than general cognitive decline.
Caveats
This observational study could not establish cause and effect. Although the association was stable across repeated analyses, it was not confirmed in a small group set aside for validation.
