why humans have two ears?

Asked by Ranjith Kumar Ranjith Kumar | 29th Mar, 2011, 03:37: PM

Expert Answer:

Dear student

To "survive and thrive," humans (and all mammals) are equipped with two ears as an efficient physiological system, to gather information about the surrounding sound environment. Two ears provide the physiological link between the physical world of sound events, and our brain which interprets and enjoys the world of sound.

With two ears, we distinguish the direction of sound. The closer ear receives the sound a few microseconds earlier and at a slightly higher intensity than the opposite ear. This is how we know the direction of a truck's approach, a calling voice, or a warning whistle. This is nature's way of protecting us.

The integration of infromation from two ears also helps us understand the speech signal we want to hear when there is background noise. Furthermore, the quality of speech is better when it is heard stereophonically, i.e. with two ears - there is added "character" and "color" to the spoken word.

 Hope this helps.




Answered by  | 31st Mar, 2011, 12:45: PM

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