Robert Bartholomew, an U.S. expert in neurodegenerative diseases at U.C.L.A., and Robert W. Baloh, a sociologist at New Zealand’s Botany College, contend that the medical problems suffered by some U.S. diplomats in Cuba are “more akin to shell shock,” a “signature feature of which was concussion-like symptoms.” They add, “A characteristic feature of combat syndromes over the past century is the appearance of an array of neurological complaints from an overstimulated nervous system that are commonly misdiagnosed as concussions and brain damage.” 
The various explanations of these medical problems have been discussed in other posts to this blog.
 Cockburn, Havana Syndrome: ‘Emotional Trauma and fear’ most likely cause of illness among US diplomats in Cuba, not mysterious sonic weapons, Independent (Nov. 1, 2019); Bartholomew & Baloh, Challenging the diagnosis of ‘Havana Syndrome’ as a novel clinical entity, J. Royal Soc’y of Medicine (Oct. 31, 2019)
 See the posts to dwkcommentaries.com listed in the “U.S. Diplomats Medical Problems in Cuba, 2017-18” and “U.S. Diplomats Medical Problems in Cuba, 2019” sections of List of Posts to dwkcommentaries—Topical: CUBA.