Symptoms include "..
ear complaints and hearing loss, dizziness, headache, fatigue, cognitive issues, and difficulty sleeping" according to the most complete list of symptoms provided so far via a federal travel warning..
https://travel.state.gov/content/tr...ies/traveladvisories/cuba-travel-warning.html
At the heart of this mystery is an apparent defiance of known scientific properties. First off, victims report that unlike normal sounds, the 'sound' is directional. Meaning you can here it in one spot, move a few feet and it is gone, to the degree of one person in a bed being able to hear it and the other not. From my understanding of acoustic waves, low frequency waves tend to be stronger in all directions whereas higher frequency waves tend to scatter and break up more easily, thus being more directional from the sound source. Apparently some low sounds were reported but mostly these higher frequencies.
The problem is that sound has never been shown to cause physiological damage like this, not due to the body's interaction with high frequency waves.If anything, the symptoms of the apparent attacks seem to align more with some type of electromagnetic radiation, but a futuristic sniper armed with an electromagnetic gun capable of hitting victims through walls sounds pretty crazy too. And what an implication, the entire cellphone industry hangs on the perception that its emf is safe, so you can bet your bonnet that now that the victims of this case have been proven to have white matter damage, industry insiders and feds galore will be hanging on every future turn of this screw, in my opinion.
I ran a frequency analyzer on the 'sound' and here is what I came up with, a spike around 7.1k and a big low end hump, seemingly comb-filtered as others have mentioned..
http://i36.photobucket.com/albums/e48/Moshimo23/001_zpsfnkp8c6v.png
Another way to look at it as that it as if the 1k region, the region for human voice, has been scooped out. Given that these events occurred at the US embassy in an area associated with antiquated technology, my guess is that somebody rigged up some slapdash spy equipment that is inadvertently frying its victims. Sure doesn't explain why people report being woken up by the sound? Maybe once the persons using the equipment found out what it was doing continued to do so as an experiment? I have heard that civilians have also reported being targeted. If somebody accidentally created a new kind of weapon, well, the implications are rather obvious why that would garner international attention.