Brain processing improves hearing in people with early-life blindness
A study suggests that blindness and musical training can lead to more consistent sound processing in the brain.
People who lost their sight before the age of two may develop superior hearing because their brains process sounds more reliably, according to a study published in the Journal of Neuroscience reported by the Times of India.
The research involved 18 sighted individuals and nine people who had been blind since early childhood. Researchers tested both groups using two tasks, including detecting tones against background noise and identifying which of two tones had a higher pitch.
The study found that those with early-life blindness performed better than sighted participants specifically in the pitch discrimination task. This indicates that the improvement comes from how the brain interprets auditory information rather than changes in the ear's sensitivity.
Using a mathematical model, researchers determined that the group with early-life blindness had lower levels of internal noise. This means their auditory systems responded to the same sounds more consistently over time.
Sighted musicians also showed lower internal noise and more consistent responses compared to those without musical training or early-life blindness. The researchers noted that these findings highlight brain plasticity, where the brain adapts based on experience.
The research team plans to investigate if these improved pitch discrimination abilities extend to complex, everyday listening. They also intend to study how the timing of vision loss or musical training affects brain plasticity.