From a linked article: Acoustic waves have never been shown to alter the brain’s white matter tracts, said Elisa Konofagou, a biomedical engineering professor

From a linked article: Acoustic waves have never been shown to alter the brain’s white matter tracts, said Elisa Konofagou, a biomedical engineering professor at Columbia University who is not involved in the government’s investigation. “I would be very surprised,” Konofagou said, adding that ultrasound in the brain is used frequently in modern medicine. “We never see white matter tract problems.” It could be environmental and maybe other locals are affected as well. But since the U.S. does this to other countries all the time, they suspect foul play.