Light stimulus prompts gerbils to display hearing behaviour
A peer-reviewed animal study shows that infrared laser light can trigger a hearing-like response without gene editing.
Japanese researchers induced Mongolian gerbils to display behaviour associated with an infrared laser stimulus to the inner ear. The study is peer-reviewed, but is still at an early preclinical stage and does not prove that this could enable humans to hear.
The researchers directed the laser through the eardrum at the cochlea, the part of the inner ear where sound vibrations are converted into nerve signals. The animals learned that a laser stimulus, like a sound signal, was followed by a water reward.
Gerbils trained with the laser subsequently displayed behaviour corresponding to their response to sound. Background noise weakened the laser-related response. Animals first trained on sound also later responded to the light stimulus.
According to the researchers, this pattern indicates that the stimulus was processed by the auditory system and was not merely a general response to heat or discomfort. However, the research measures behaviour; it does not directly show what subjective sound quality the animals experienced.
The results were published in iScience. The study is therefore peer-reviewed, but the experiments were conducted on animals. No clinical trial involving humans has been reported, and no device suitable for daily use has been described.
Existing cochlear implants work with implanted electrodes and an external or subcutaneous component that processes sound. The optical approach attempts to stimulate the auditory periphery with light and could, in theory, produce less invasive aids.
The main limitation is the step from gerbil to human. Safety, the light energy required, precision, long-term effects and whether people could distinguish meaningful speech still need to be investigated. The study is therefore primarily proof of feasibility in an animal model, not a new treatment.
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The study, its publication status and the animal experiments were directly checked through PubMed and the university’s explanation. The text draws no clinical conclusions unsupported by the sources.
- confirmed The study was published in iScience and is peer-reviewed. — PubMed lists iScience as the journal and the article as a journal article; the press information refers to a peer-reviewed publication. source
- confirmed The experiments were conducted with Mongolian gerbils. — This is stated in the publication’s title and abstract. source
- confirmed The laser stimulus led to reliable hearing-guided behaviour. — The abstract describes conditioned licking behaviour and generalisation to the laser stimulus. source
- confirmed No clinical results in humans have been reported. — The checked sources describe animal experiments only. source
Editor's note
This is a peer-reviewed animal study. No clinical results in humans are available; terms such as treatment, breakthrough and recovery have therefore been avoided.Sources
- Optical induction of auditory perception via cochlear stimulation in Mongolian gerbils without genetic modification — PubMed/iScience
- Non-invasive optical stimulation for induction of auditory perception — EurekAlert!/Doshisha University
- 光で聴覚を呼び起こす人工聴覚器の可能性 — Keio University