Petra....I did not deliberately give myself a concussion...I even note that that was a joke at the bottom of the post. I did accidentally get a concussion. The point was whether or not a CAT scan of the head could cause one to hear eartones...not whether banging your head could cause you to hear eartones. You were involved in this discussion a couple of months ago....you (and I?) may have been proposing that eartones were real (meaning, external) and might be caused by electromagnetic waves. Unlike sonograms, which I think are sound (hence..."sono")..... according to: http://www.colorado.edu/physics/2000/tomography/
CAT scans are xrays.
To clarify...you think that eartones are external.....and I don't know...have not seen any evidence on this page (beyond your Parkfield prediction and maybe the other one about that time) that they are external but have not ruled it out.
Chris