Weve all experienced that person whos talking on his cell phone in public, in a voice thats way too loud on the train, in a restaurant, or walking down the street, screaming into the mobile, oblivious to the effect he's having on the crowd nearby.
We rarely experience this with a land line phone. Thats because when we talk on a land line phone, Theres a small percentage of our voice thats fed back to us. Its called "sidetone, according to former Bell Labs scientist Dr. Steve Crandall. About 18 decibels of sound (the loudness of a whisper) comes back to us to give us an indication that our voice is being heard on the other side of the connection. When we have that feedback, we are less apt to make a spectacle of ourselves.
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