A quick/brief response - a human requires to hear equally in both ears to allow the brain to correctly process "INTEGRATE" the sounds intially coming through the auditory canal (ear holes).
This requirement for correct human functioning is still not well understood by many "experts" that perpetuate the myths that allow 'the misguided' to force Pilots, and many other Operators (including some with command of weapons) to have differential signals sent to their Headsets/Helmets. By differential I mean seperate audio information in each ear that has to be processed and integrated 100% accurately otherwise errors can occur. And in aviation that can have very serious outcomes....e.g "friendly fire" or failure to respond in time to an emergency indication either via electronic audio or via someone else in the cockpit voicing their instructions (or shouting when no action is apparent by the person at the controls).
Differential would also include "one ear on/one ear off"......
I have just "scratched the surface" here.
This is a very misunderstood and vitally important topic that needs a lot more dissemination of correct information amongst 'thinking Pilots/Instructors/Administrators'.
