"Have you ever walked through a factory where the noise of rumbling machines filled the air, or an airport where planes constantly roared overhead? How could anyone work under these conditions without hurting their ears? It’s not just a problem in industry. Every day we repair our homes with noisy power tools and surround ourselves with blaring music.
"Yet most of the time, we hardly notice. It’s all because the Creator gave our sense of hearing a built-in safety mechanism that defies natural explanation. Your eardrum is wonderfully designed to sense the tiniest changes in air pressure. But this has a potential downside. Loud, sustained noises could easily push the delicate parts of the inner ear beyond their safety limit, causing permanent damage.
"By God’s wise design, however, something special happens under these conditions. God put a series of three tiny bones in your middle ear to pick up most vibrations. For their protection, He attached two tiny muscles to the first and last of these bones (the malleus and the stapes). At the instant these bones begin to vibrate beyond normal limits, the brain senses danger and sends a signal to tighten the muscles and momentarily shut down the ear’s sensitivity. This happens in a split second and is involuntary, a phenomenon called negative feedback.
"The inner ear is thus protected from injury. In an opposite situation, with very soft sounds, the muscles may loosen somewhat to increase sensitivity. This delicate balancing act allows us to hear a wide range of sounds without damage.
"How could this built-in safety mechanism possibly arise naturally by evolution if early humans rarely experienced loud sounds other than perhaps thunder or the roar of a nearby predator? Constant loud sounds and background noises are a modern phenomenon, with industrial machinery, blaring audio speakers, and gas-driven motors. Yet the ear of the original humans was already fully equipped to protect us before these threats even arose.
"It is reasonable to suggest that the all-wise Creator planned ahead to protect our ears from modern industry’s noisy environments. In contrast, evolution cannot explain how random mutations could possibly plan ahead for future needs."
Don DeYoung - Answers Magazine - January 8, 2017.
Dr. Don DeYoung is Chairman of Science and Math at Grace College, Winona Lake, IN, and he is currently president of the Creation Research Society.
Complete article including an experiment - https://answersingenesis.org/human-body/selective-hearing/