Tel Aviv University researchers have developed musical tests that measure brain activity in old age. 50 patients from Dorot-Netanya Geriatric Medical Center performed melodies on different musical instruments while electrical brain activity was recorded.
https://www.sciencedaily.com/releases/2022/08/220817104010.htm
https://www.frontiersin.org/articles/10.3389/fnagi.2022.773692/full