Doctors treating the victims of mysterious, invisible attacks on the US embassy in Cuba have discovered brain abnormalities as they search for clues to explain the damage to their hearing, vision, balance and memory.

The most specific finding to date about physical damage from the attacks shows that whatever it was that harmed the Americans, it led to perceptible changes in their brains. It is one of several factors fuelling growing scepticism that some kind of sonic weapon was involved. Medical testing has revealed the embassy workers developed changes to the white matter tracts that let different parts of the brain communicate, several US officials said, describing a growing consensus held by university and government physicians researching the attacks. White matter acts like information highways between brain cells.

Loud, mysterious sounds followed by hearing loss and ear-ringing had led investigators to suspect “sonic attacks”. But officials are now avoiding that term. The sounds may have been the byproduct of something else that caused damage, said three US officials briefed on the investigation.(theguardian)…[+]