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Hearing Through Someone’s Ear Will Be Different Experience Altogether: Study
January 14, 2008 at 7:12 PM
Research News
The research, which features in the current issue of BBSRC Business, could help to develop more sophisticated hearing aids and more effective speech recognition systems.
The research team at the University of Oxford, led by Dr Jan Schnupp, have studied the auditory cortex of the brain and discovered that its responses are determined not merely by acoustical properties, like frequency and pitch, but by statistical properties of the sound-scape. In the world loudness and pitch are constantly changing. The random shifts in sounds are underpinned with a statistical regularity. For example, subtle and gradual changes are statistically more regular than large and sudden changes. Dr Schnupp's team have found that our brains are adapted to the former; the neurons in the auditory cortex appear to anticipate and respond best to gradual changes in the soundscape. These are also the patterns most commonly found in both nature and musical compositions.
Dr Schnupp, a research leader at the University of Oxford Auditory Neuroscience Group, said: "Our research to model speech sounds in the lab has shown that auditory neurons 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."
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