Blind people and experienced musicians distinguish pitches better, with less brain noise
Are people who have been blind for most of their lives better at hearing than sighted individuals? In a new study in JNeurosci, Woon Ju Park, from the Georgia Institute of Technology, and colleagues explored this question by comparing tone detection and pitch discrimination in people with and without sight.
In a new study published in JNeurosci, researchers from the Georgia Institute of Technology explored whether people who have been blind since birth possess superior hearing abilities compared to sighted individuals. The study focused on two aspects of hearing: tone detection, which involves the cochlea in the ear, and pitch discrimination, which occurs in the brain's cortical processing region.
Both groups of individuals were able to accurately detect tones, but those with lifelong blindness demonstrated greater proficiency in distinguishing pitch differences.
Further investigation revealed that individuals who became blind early in life exhibited less internal noise in their brain's response to the same pitch, a phenomenon known as internal noise. This reduced internal noise allowed them to more accurately discriminate between pitches. To determine whether this effect was exclusive to vision loss or also applicable to other groups with exceptional listening skills, researchers compared the auditory performance of musicians with varying levels of experience.
Similar to individuals with blindness, those with extensive musical training exhibited reduced internal noise, which facilitated their pitch discrimination abilities.
Woon Ju Park, the lead researcher, noted that this enhanced hearing in early-blind individuals is not a general improvement across all auditory tasks. Instead, it appears to be more specific to tasks that rely on processing auditory information in the brain. This intriguing finding suggests that the improvements may be due to experience-dependent changes in how individuals use auditory information.
The researchers concluded that enhanced pitch perception in people with early-life blindness and musicians is attributed to reduced internal noise in auditory processing, rather than a general auditory enhancement.
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