Japan's new bone conduction cellphone

If you have trouble hearing in noisy environments when talking on your cellphone, Japan may have a solution for you. A popular Japanese cellphone provider, KDDI announced that they will release a bone conduction cellphone model A1407PT by Pantech in the next few weeks.

Bone conduction is not a new technology and has been used as an alternative amplification device for hearing impaired individuals who cannot benefit from traditional hearing aids. The basic principle of bone conduction is that a device, in this case a cellphone speaker, is pressed to the head just behind the ear on the mastoid bone. Sound is heard via sounds waves transversing the skull rather than through the outer and middle ear.

This niche product is aimed at workers in Japan that are at building sites with background noise that masks out speech from the cellphone. This technology will only be available in Japan at this time.

Credit: Tech.co.uk

MIT researchers discover a new hearing mechanism

An article on the Massachusetts Institute of Technology's (MIT) news website published on October 10, 2007 reported that MIT researchers have discovered a mechanism inside the inner ear that functions in a different way. For over 50 years, it has been known that sound waves inside the cochlea travel in an up-and-down manner. But the research team noted in the article has found that sound energy can also be carried by a traveling wave that moves from side-to-side. Read the article to learn more about the potential impacts of this discovery.

Click here to read the article: MIT finds new hearing mechanism

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Credit: Ghaffari, Aranyosi, and Freeman, MIT

Dancing outer hair cell

This post is just another reason why our auditory system is so fascinating. To appreciate this movie, I need to give a short explanation of some auditory structures and their role in hearing.

The cochlea is a snail-shaped structure in the inner ear (beyond your eardrum) that is the sensory organ of hearing. There are microscopic hair cells with stereocilia at the tips within the cochlea that are responsible for moving in response to vibrations. Basically, it is the motion of the sensory hair cells that allows signals to be sent to the brain via the auditory nerve and process sounds we hear.

The image on the right shows a top view of the stereocilia of an outer hair cell in the cochlea. Credit: www.neuroscience.cam.ac.uk

Hair cells are most sensitive and contract at specific frequencies. They can degenerate over our lifetime with age and can also be damaged when we are exposed to very loud sounds, which is why it is important to always protect your ears. UK Scientist, Jonathon Ashmore was able to isolate a single outer hair cell and make it dance! That's right, dance...presenting you with the DANCING OUTER HAIR CELL!
Read an explanation of movie from Ashmore's website here: http://www.physiol.ucl.ac.uk/ashmore/hairexpl.htm