Illustration showing how electrical impulses travel to the brain
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Electrical impulses travel along the auditory nerve and pass through several information-processing centers. Signals from the right ear travel to the auditory cortex located in the temporal lobe on the left side of the brain. Signals from the left ear travel to the right auditory cortex.

The auditory cortices sort, process, interpret and file information about the sound. The comparison and analysis of the all the signals that reach the brain enable you to detect certain sounds and suppress other sounds as background noise.