Hearing is one of the traditional five senses, and refers to the ability to detect sound. The sense of hearing is sound perception and results from tiny hair fibres in the inner ear detecting the motion of a membrane which vibrates in response to changes in the pressure exerted by atmospheric particles. Basically, sound is detected by the ear and transduced into nerve impulses that are perceived by the brain as sounds.
The visible portion of the outer ear in humans is called the auricle or the pinna. It is a convoluted cup that arises from the opening of the ear canal on either side of the head. The auricle helps direct sound to the ear canal. Both the auricle and the ear canal amplify and guide sound waves to the tympanic membrane or eardrum. In humans, amplification of sound ranges from 5 to 20 dB for frequencies within the speech range (about 1.5-7 kHz). Since the shape and length of the human external ear preferentially amplifies sound in the speech frequencies, the external ear also improves signal to noise ratio for speech sounds.
Memory Basics: How We Process Information::
Scientists generally agree that memory depends on three basic mental processes: For example, sensory information (what we see, hear, smell,
http://www.successfulaging.ca/programs/memory/05.htmlHOME |
Radiation and Radioactivity | Radiation Protection | US EPA::
When we hear the word ' radiation,' we generally think of nuclear power plants, nuclear weapons, Please see: Radiation Protection Basics. Top of page
http://www.epa.gov/radiation/understand/index.htmlHOME |
The eardrum is stretched across the front of a bony air-filled cavity called the middle ear. Just as the tympanic membrane is like a drum head, the middle ear cavity is like a drum body. Much of the middle ears function in hearing has to do with processing sound waves in air surrounding the body into the vibrations of fluid within the cochlea of the inner ear. Sound waves move the tympanic membrane, which moves the ossicles, which move the fluid of the cochlea.
Brandon Davis' meltdown at Setai::
Back to Basics. Posted Tue. Feb. 19, 2008 8:15am by Page Six WE HEAR that another actor from writer/director Judd Apatow's stable of talent is ready to
http://pagesixsixsix.com/story/back+basicsHOME |
The cochlea is a snail shaped fluid-filled chamber, divided along almost its entire length by a membranous partition. The cochlea propagates mechanical signals from the middle ear as waves in fluid and membranes, and then transduces them to nerve impulses which are transmitted to the brain. It is responsible for the sensations of balance and motion.
Humans can generally hear sounds with frequencies between 20 Hz and 20 kHz. Human hearing is able to discriminate small differences in loudness (intensity) and pitch (frequency) over that large range of audible sound. This healthy human range of frequency detection varies significantly with age, occupational hearing damage, and gender; some individuals are able to hear pitches up to 22 kHz and perhaps beyond, while others are limited to about 16 kHz. The ability of most adults to hear sounds above about 8 kHz begins to deteriorate in early middle age. The AudioPro Home Recording Course :: A Comprehensive Multimedia - Google Books Result::
href=http://books.google.com/books?id=qeK6mZy6sV0C&pg=PA62&lpg=PA62&dq=how+we+hear+the+basics&source=web&ots=G2KLky4zNg&sig=riBaA7jVaXvzqCHqkwYchzfXd04&hl=en class=l onmousedown=return clk(this.href,,,res,52,)>The AudioPro Home Recording Course :: A Comprehensive Multimedia - Google Books Resultby Bill Gibson - 1997 - SoundRight now it's most important to know the basics of signal processing. Notice that we consistently describe what we hear with terms normally used for
http://books.google.com/books?id=qeK6mZy6sV0C&pg=PA62&lpg=PA62&dq=how+we+hear+the+basics&source=web&ots=G2KLky4zNg&sig=riBaA7jVaXvzqCHqkwYchzfXd04&hl=enHOME |
Pre-Article:The Science Of Hoodia Gordonii And How It Works
Next-Article:Cataracts - Are They Unavoidable?
|
How We Hear - The Basics