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  Ear

EAR:

Our ears give us with two vital though very diverse senses: hearing and balance. Sound detected by the ears gives necessary information about our external surrounding and permit us to communicate. Additionally our ears contribute to our logic of balance to sustain upright posture and move without falling over.

Sound is the sensation generated by longitudinal vibrations in the external atmosphere. Loudness of sound is connected with amplitude of sound wave and pitch with frequency (i.e., No. of waves/unit time). Audible frequencies to humans are in the range of 20 - 20,000 cycles per second (cps, Hz). Only the young people are capable to hear this complete range.

Sound perception based on the loudness and also frequency. The human ear is most susceptible to 50 - 5000 Hz range. Though most of the sounds we normally hear fall in 500 - 5000 Hz. As the human ear can distinguish a wide range of sound energy (i.e., the loudest noise perceived is around 1012 times more strong than the softest whisper) the decibel (dB) scale is utilized to measure the intensity of sound.

Our capability to hear based on a complex sequence of events which takes place in the ear. Sound waves in the air are transmitted as vibrations via a sequence of structures to the receptor for hearing. The physical vibrations are detected and transformed into electrical signals. Nerves carry electrical signals to the brain where they are interpreted. The interpreted messages permit us to perceive the subtleties of sounds like speech and music.

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