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Why does our own voice sound unfamiliar when we hear it on tape? When we listen to ourselves speak, we hear both the sound conducted by air waves to the outer ear and that carried directly to the auditory nerve by bond conduction. The latter is easily demonstrated by clicking the teeth or munching popcorn, or by striking the prongs of fa fork on a table and quickly applying its handle to the bone behind the ear. An even more resounding effect will be produced if the handle is clenched between the teeth.
Try out this demonstration and write a paragraph about your experience.
Now, you will follow the instructions and write another paragraph about the next experiment. Use a metal coat hanger tied to the center of a thin string about four feet long. First press one end of the string into each ear with the tips of the index fingers while plugging your ears. Ask a friend to tap the coat hanger with a knife or fork. What effect did you experience and why? Write paragraph two.