That headline seems inaccurate -- I was surprised when it seemed to point to "sonic attacks" being the definitive cause of the brain abnormality, but it's not:

That headline seems inaccurate -- I was surprised when it seemed to point to "sonic attacks" being the definitive cause of the brain abnormality, but it's not: “The study supports the validity of the patients report of symptoms, but doesn’t answer the question of whether they have had a brain injury or not or whether the exposure they report is relevant." So something happened, but no one knows what caused it.