A client does not like to wear a ski helmet while skiing because he is unable to hear other skiers around him as clearly. The ski helmet would interfere with the __________ of sound
1. Air conduction
2. Bone conduction
3. Nerve conduction
4. Middle ear conduction
Air conduction
Rationale: Air conduction begins when noise enters the external ear canal and travels to the middle ear. Material covering the external auditory canal would interfere with sound waves entering the canal. The nerves related to hearing are located in the inner ear. Sound is interpreted by vibrations in the inner ear. Middle ear conduction is not a mechanism of hearing. Bone conduction occurs when the bones of the middle ear vibrate.
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