(CNN)
Whatever was behind the "sonic attacks" experienced by US government personnel in Havana, Cuba, starting in late 2016 remains a mystery -- but a new study published Tuesday looks inside the workers' brains for clues.
MRI brain scans from 40 patients -- 23 men and 17 women -- showed variations in brain structure and functional connectivity, which measures relationships among different brain regions, when compared with 48 other adults. The scans were taken between August 2017 to June 2018.
"There were group differences all over the brain," said study author Ragini Verma, professor of radiology and neurosurgery at University of Pennsylvania's Perelman School of Medicine. "Especially in an area called the cerebellum, which is also implicated in the kind of clinical symptoms that most of these patients were demonstrating, which is balance, eye movement, dizziness, etcetera." Read more