This still has me thinking.
Now with the sound of voices coming from different locations saying things like. "Tom, get your shot gun and if you see them shoot till they stop moving". Then the sound of a shotgun being racked.
Am starting to visualize a real "fun house" here.
Subsonic sound inducers could be used.
Infrasonic sound, to call it by its right name, has some effect on human "hearers," although it falls a little short of "acute anxiety." The frequency range of normal human hearing is 10-24,000 hertz. Researchers have found that frequencies as low as one hertz (one cycle per second) have a definite effect on the inner ear, somehow short-circuiting its equilibrium and causing dizziness.
Not really expecting anyone to do this..but interesting to explore.