An anonymous reader quotes a report from Ars Technica: American victims of mysterious attacks in Cuba have abnormalities in their brains' white matter, according to new medical testing reported by the Associated Press. But, so far, it's unclear how or if the white-matter anomalies seen in the victims relate to their symptoms. White matter is made up of dense nerve fibers that connect neurons in different areas of the brain, forming networks. It gets its name from the light-colored electrical insulation, myelin, that coats the fibers. Overall, the tissue is essential for rapidly transmitting brain signals critical for learning and cognitive function.
In August, U.S. authorities first acknowledged that American diplomats and their spouses stationed in Havana, Cuba, had been the targets of puzzling attacks for months. The attacks were carried out by unknown agents and for unknown reasons, using a completely baffling weaponry. The attacks were sometimes marked by bizarrely targeted and piercing noises or vibrations, but other times they were completely imperceptible. Victims complained of a range of symptoms, including dizziness, nausea, headaches, balance problems, ringing in the ears (tinnitus), nosebleeds, difficulty concentrating and recalling words, permanent hearing loss, and speech and vision problems. Doctors have also identified mild brain injuries, including swelling and concussion. U.S. officials now report that 24 Americans were injured in the attacks but wouldn't comment on how many showed abnormalities in their white matter.
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