The short version
- In adult mice with hearing loss, a visual brain area responded more weakly to things in peripheral view and the same as before to things straight ahead.
- Those mice perceived peripheral visuals more clearly than mice with normal hearing.
- The study is in mice, and the published summary gives no numbers, so nothing yet says the same happens in people.
Neuroscientist Hey-Kyoung Lee’s lab at Johns Hopkins studied mice that lost their hearing as adults. In a visual area of their brains, responses to things in the center of view did not change. Responses to things in the periphery were “strongly dampened.” Yet in behavioral tests, the mice with hearing loss saw peripheral visuals more clearly than mice with normal hearing. The Society for Neuroscience reported the paper, in JNeurosci, on November 2.
Quieter neurons and sharper sight sound like a contradiction. Lee’s reading is that “dampening neural activity may be beneficial by improving the brain’s efficiency at processing information.” The change has limits: the adaptation “does not improve all visual function.” The point is that an adult brain, not only a developing one, rebalanced the senses after hearing went. The journal page would not load for us, so we could not check how many mice were tested, how their hearing loss was induced or how large the effects were.
For now it is a finding about mouse cortex, not about people who lose their hearing in midlife.
