LASERS HELP THE DEAF HEAR

A research team from the University of Utah led by Richard Rabbitt has found that lasers may be able to give deaf people the ability to hear. Using a low-power infrared diode -- similar to those in laser-pointers tormenting cats the world over -- Professor Rabbitt found that exposing oyster toadfish hair cells (analogous to the cells found in humans' inner ears) to infrared light caused them to release neurotransmitters and activate adjacent neurons. This could lead to laser-based ear implants able to stimulate focused areas of cells with thousands of sound wavelengths, as opposed to today's electrode implants whose electrical current spreads through human tissue and limits the deliverable sonic range. Smaller, more efficient power supplies and light sources are needed before optical hearing aids become a reality