Scientists closer to understanding how the ear perceives speech

The inner ear processes low-frequency sounds, important for speech and music perception, differently to high-frequency sounds, new research has found. Low frequency sounds, below four kilohertz, are used by human ears for perceiving speech. However, the exact mechanism for how the inner ear processes these important sounds is poorly understood, as the organ is difficult to access in experiments. It is surprising that we know so little about this important part of hearing, but encouraging that experiments are now pointing the way towards a robust theory of low-frequency sound perception. Knowing how the ear processes the sounds could help scientists to understand what happens when the process doesn't work, causing hearing loss. It could also allow engineers to borrow from nature, using the mechanism to design new audio equipment. The new research, by an international team including researchers from Imperial College London as well as institutions in Sweden and the US, has shown one vital difference in the way highand low-frequency sounds are processed by the ear.