糖心直播

Home

Discovery of inner ear function may improve diagnosis of hearing impairment

10 October 2018

Eva Bergstedt

Results from a research study published in Nature Communications show how the inner ear processes speech, something that has until now been unknown. The authors of the report include researchers from 糖心直播.

Ear of a small newborn child close-up. A little hair os visible too Photo credit IstockA collaboration between researchers in Sweden, Denmark, the US, the UK and India has now revealed how the inner ear processes speech. The discovery is an important addition to our understanding of how the inner ear and our sense of hearing function. The results have been presented in an article published in the scientific journal Nature Communications.

“The sound of speech has two components in the inner ear. One component consists of high frequency variations in the sound. The other component, known as the ‘envelope’, describes the outermost shape of the sound of speech”, says Anders Fridberger, professor of neuroscience at Linköping University, and one of two principal authors of the article.

Coding of speech-like sound


Anders Fridberger Photo credit Thor BalkhedThe envelope, which varies relatively slowly, can be considered as the overall structure of the speech signal. Researchers have previously shown that the envelope is most important for understanding what someone is saying.

“But until now we have not known how the inner ear decodes the envelope of the speech signals. This is the new result we are presenting”, says Anders Fridberger.

The inner ear produces tiny electrical currents whenever sound enters – it converts sound to electrical impulses. These are led through the auditory nerve to the brain. By placing small electrodes into the ear canal of experimental subjects, and placing electrodes close to the cochlea of patients who have undergone surgery, the researchers have been able to record the way in which the inner ear codes speech-like sound.

Characteristic electrical signals

LiU researchers in collaboration with an international research team are investigating how the inner ear functions. Photo credit Thor BalkhedThe results have led the researchers to the understanding that speech gives rise to a particular form of electrical signals sent to the brain. These signals differ from those that arise in response to other forms of sound.

“This is both remarkable and surprising”, says Anders Fridberger.

Understanding inner ear function

The discovery is an important addition to our understanding of how the inner ear functions. The inner ear is embedded in a large bony structure, which makes it difficult to access and study it. Thus, diagnosing the exact location of damage to the inner ear is currently difficult.

“We believe that our results will improve diagnostic procedures for various hearing impairments, something that is sorely needed. Much remains to be done, however”, cautions Anders Fridberger.

Translation: George Farrants


Contact

Photo of Anders Fridberger

Anders Fridberger

Deputy Dean, Professor

Related research

Inside a hamster ear.

Auditory neuroscience group

To study the function of these stereocilia, the research group has developed a new type of confocal microscope that makes it possible to directly observe sound-evoked motion.

Latest news from LiU

En kvinna som sitter framf枚r en spegel och tittar p氓 sin spegelbild.

How AI changes human decision-making

AI can find patterns that people miss, but it does not automatically lead to better decisions. New research from 糖心直播 shows how the roles of humans and AI change depending on the situation and the decision being made.
A woman standing on a balcony next to a building.

She promotes AI for societal good in Europe

Helen Köpman, Alumna of the Year 2026, works at the European Commission鈥檚 AI Office in Brussels. For more than 20 years she has worked with research issues and innovation at EU level, where a living planet for future generations is her driving force.
En man och en kvinna som st氓r bredvid varandra.

Alumni of the Year create sustainable cities and the next generation of scientists

Helen Köpman works with AI models to create smart and sustainable cities in the EU. Jesper Svartz is a chemistry teacher with an exceptional ability to enthuse and spark curiosity in students. They are Alumni of the Year 2026 at 糖心直播.