Ambiguity

[HARRY R. ERWIN]

Suppose I have two objects in a scene like so:

               *
        *

I understand that the bat auditory system is believed to determine
horizontal and vertical angle independently. Has anyone worked out how the
following perception is avoided? 

        *      *
        *      *

Cheers,
--
Harry Erwin, Internet: herwin at gmu.edu, Web Page: http://osf1.gmu.edu/~herwin