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Lend me your ears -- and the world will sound very different
Date:1/13/2008

in the brain are adaptable and we learn how to locate and identify sounds. Each person's auditory cortex in their brain is adapted to way their ears deliver sound to them and their experience of the world. If you could borrow someone else's ears you would have real difficulty in locating the source of sounds, at least until your brain had relearned how to do it."

Dr Schnupp has also found that the auditory cortex does not have neurons sensitive to different aspects of sound. When the researchers look at how the auditory cortex responds to changes in pitch, timbre and frequency they saw that most neurons reacted to each change. Dr Schnupp explains: "In the closely related visual cortex there are different neurons for processing colour, form and motion. In the auditory cortex the neurons seem to overwhelmingly react to several of the different properties of sound. We are now investigating how they distinguish between pitch, spatial location and timbre.

"If we can understand how the auditory cortex has evolved to do this we may be able to apply the knowledge to develop hearing aids that can blot out background noise and speech recognition systems that can handle different accents."

The Oxford team's current project is using BBSRC funding to fit trained ferrets with harmless auditory implants. The animals are trained to respond to different sounds and the implants enable the team to observe the auditory neurons as the ferret responds to different sounds.

Professor Nigel Brown, BBSRC Director of Science and Technology, said: "This research is revealing how our senses work and how the brain interprets information from the ears. These BBSRC-funded studies of a fundamental biological process may bring exciting developments in helping people with hearing and other disabilities."


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Contact: Matt Goode
matt.goode@bbsrc.ac.uk
44-179-341-3299
Biotechnology and Biological Sciences Research Council
Source:Eurekalert

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