Actually, I don't think the Cubans are doing anything. The physics behind the 'sonic' weapons just doesn't work.
If there are brain abnormalities, I'd suspect a poison, a bacterium or a virus... none of which was necessarily done by the Cubans.
A buddy of mine is headed down there in a few days. I'll let you know what his take is.
But I think this whole thing has been a big ball of horse hockey since the beginning. If there are now brain abmormalities showing, I'd not be looking at 'sonic attacks' but at something a lot more pedestrian. Mainly that it's a tropical shithole full of tropical shithole diseases. And damn little in the way of environmental controls. Probably eating Cuban sandwiches filled with pork that was raised on battery cores and octopus full of seaside toxins.
Cheers,
Sirhr