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Author: admin, 23.09.2015
Vowel sounds like a short a€?oa€? as in the word a€?hot,a€? have low frequencies (250 to 1,000 Hz) and are usually easier to hear. Consonants like a€?s,a€? a€?h,a€? and a€?f,a€? have higher frequencies (1,500 to 6,000 Hz) and are harder to hear. Sounds that are 120 dB or louder can be painful and can result in temporary or permanent hearing loss.
Different groups and organizations use decibels to define the degree of hearing loss differently. The Eustachian tube is labelled in the diagram at the top of this page as the auditory tube. The function of the Eustachian tube is to equalise pressure between the middle and out ear, preventing damage to the tympanic membrane as a result of changes in air pressure.


Insect have a membrane,A  the tympanum stretched across a frame with an air sac behind it.A  Vibrations are detected by an receptor called a chordotonal organ. The lateral line of the European Roach (left).A A  The structure of the lateral line showing a neuromast (right).
The Eustachian tube is labelled in the diagram at the top of this page as the auditory tube.A  The tube is usually closed but can open to allow a small volume of air to pass between the middle ear (the area between the tympanic membrane and the oval window) and the nasal cavity. The function of the Eustachian tube is to equalise pressure between the middle and out ear, preventing damage to the tympanic membrane as a result of changes in air pressure.A  We become aware of the Eustachian tube when our ears a€?popa€? when ascending or descending a steep mountain in a car or changing altitude in an unpressurised aircraft. The cochlea and semi-circular canals (associated with the detection of motion).A  Notice the oval window (vestibular fenestra) and round window (cochlear fenestra).
Another possibility is to do with the size of the organs producing the sound.A A  It would be very difficult for a sparrow to be able to produce the frequencies used by elephants because their bodies are so small.


Identify the direction from which sound is coming is called sound localisation.A  Mammals a number of different methods of localising sound, including timing the difference between arrival times at the ear. A person who has hearing within the normal range can hear sounds that have frequencies between 20 and 20,000 Hz. Someone who cannot hear high-frequency sounds will have a hard time understanding speech and language.




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