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Our Ear Over looked

Our Ear Over looked. Though our hearing is FAR more sensitive than our vision, about 1/3 of our brains are devoted to the visual cortex , a complexity of dispersed areas acting together. The fMRI image below shows both visual and auditory areas. sight. Reading & Writing in New Media

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Our Ear Over looked

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  1. Our EarOverlooked • Though our hearing is FAR more sensitive than our vision, about 1/3 of our brains are devoted to the visual cortex, a complexity of dispersed areas acting together. The fMRI image below shows both visual and auditory areas. sight Reading & Writing in New Media CARLETON hearing

  2. We see the world through a very small window: wavelengths between 400-700 nanometers (billionths of a meter) a factor of 2/1 in frequency… But what exists that we cannot see? Read “The Damned Thing” by Ambrose Bierce

  3. …but our hearing is VAST: pressure wavelengths between 20Hz - 20,000Hz, frequency factor of 1000/1

  4. our amazing anatomy: 4-relay 3-reception cochlear oval window at stapes 1-collection 2-amplification

  5. “place theory” of hearing …the idea that the position of the ‘hair cell’ along the basilar membrane in the cochlea corresponds to its frequency response with lower frequencies (20Hz)* detected closer to the oval window and increasing at regular intervals up to high frequency sounds (20kHz) detected towards the round window. The nerve endings in the cochlea convert sound air-pressure waves into electrical signals for the brain via a complex shearing motion between the tectorial & basilar membranes. * 1 Hertz (Hz) = 1 wavelength =

  6. cochlea:our spiral sonic receptor 3.5 cm long 30,000 nerve endings a.k.a. “hair cells” wavelengths of sonic receptivity

  7. astonishing complexity

  8. Sound must travel farther than sight to reach the brain.

  9. Our hearing compared with our fellow inhabitants…

  10. Resources Berg, Richard E. The Physics of Sound, 3rd edition Upper Saddle, NJ: Pearson, 2005. Calvert, J. B. “Hearing and Sound.” 2000. (11/20/08) http://hyperphysics.phy-astr.gsu.edu/Hbase/hph.html#ahph1 McLuhan, Marshall. Understanding Media (1964) Critical edition Terrence Gordon, ed. Corte Madera: Gingko Press, 2003. Nave, Carl R. “Ear and Hearing” Hyperphysics:Sound. Georgia State University, 2001. (11/20/08) http://hyperphysics.phy-astr.gsu.edu/Hbase/hph.html#ahph1 Rossing, Thomas D. The Science of Sound, 3rd edition San Francisco: Addison Wesley, 2002.

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