How do the ear and brain work together to help you perceive sound?

You hear things-people talking, car horns honking, and dogs barking. You know what these sounds are because your ears and brain work together.

When something makes a sound, the air around it moves, or vibrates. The vibrations travel through the air as sound waves. The sound waves enter your ear and bump against your eardrum. When the sound waves hit it, your eardrum moves.

When your eardrum moves, it bumps into three small bones. As each bone bumps the next, the third moves in and out of an opening in another part of the ear called cochlea. The cochlea is shaped like a shell.

Inside the cochlea are liquid and nerves. As the bone moves in and out of the cochlea, it makes waves in the liquid. The waves move across the nerves. The nerves carry messages to your brain. Your brain tells you what sound you are hearing.

How well do you and your friends know the sounds around you? Make a tape recording of different sounds you hear every day, such as your parents talking, a car starting, a door closing, computer turning on, a toilet flushing, a clock ticking, and a dog barking. Leave a moment of silence between each sound. After you have made your recordings, ask your friends to listen to each sound on the tape. See if they can guess what the different sounds are. If you do not have a tape recorder, you and your friends can take turns making sounds. Get your friends to cover their eyes as they listen to you making different sounds. You might pour water, crumple paper, and open an umbrella.

Picture Credit : Google

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