MIT graduate student Anthon Martorell and Georgia Tech graduate student Abigail Paulson studied the effect of gamma brainwave stimulation, using both light and sound, in the progression of Alzheimer’s disease.
The results so far are encouraging though efficacy is only suggested in mouse studies. While hopes are high, many approaches that appeared beneficial in mouse studies are later found ineffective in human trials. Since this is a very non-invasive approach, I would expect the timeframe to human studies to be much shorter than with traditional pharmaceutical methods.
Massachusetts Institute of Technology. “Brain wave stimulation may improve Alzheimer’s symptoms: Noninvasive treatment improves memory and reduces amyloid plaques in mice.” ScienceDaily. ScienceDaily, 14 March 2019.
https://www.sciencedaily.com/releases/2019/03/190314111004.htm