The theory that a sonic weapon caused the diplomats’ ailments is not universally held, with some scientists doubting the validity of such claims. But now a new study may have provided a tangible and measurable link that connects the physiological symptoms suffered by the diplomats. The study, published in the latest issue of the Journal of the American Medical Association,The study, published in the latest issue of the Journal of the American Medical Association, is based on a detailed examination of data from magnetic resonance imaging studies that assessed both structural and functional endpoints of the brains of the victims of the alleged sonic attacks. Scientists at the University of Pennsylvania took these images of the brains of 40 individuals who complained of acute auditory and other sensory disturbances while in Cuba, and compared them with those of healthy participants. The latter were matched with the patients for age, lifestyle and general background. According to the study, the comparison revealed statistically significant differences in various structures of the subjects’ brains. The differences were most pronounced in the white matter of their brains. The white matter is important because it is comprised of the myelin-protected nerve fibers that are responsible for transmitting the electrical signals from one brain cell (neuron) to another. Damage to these regions would result in a reduction of the brain’s ability to process information as rapidly as the brains of non-affected individuals. According to the study, the volume of white matter in the brains of the alleged sonic attack victims was approximately five percent smaller than that in the brains of healthy adults.

One of the scientists behind the study told the British newspaper The Daily Telegraph that his team of researchers have not seen “anything like it before”. But he added that he and his colleagues are “not sure […] what it is”, though “there does appear to be something there”. Another expert told the paper that the findings of the University of Pennsylvania study supported the validity of the symptoms reported by the American diplomats. However, they do not help answer the question of whether they suffered actual brain injuries. A spokesman from the United States Department of State told The Telegraph that the Department is “aware of the study and welcomes the medical community’s discussion of this incredibly complex issue”.