> Out of interest, how do we know it's not a common but undocumented form of tinnitus? I get the impression you can measure the sounds waves just fine, the fol

> Out of interest, how do we know it's not a common but undocumented form of tinnitus? I get the impression you can measure the sounds waves just fine, the folks investigating it just have a problem locating it. Which can happen if the noise doesn't come from a point source, and/or its wave form features aren't well suitable for tracking.