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Scientists Find Why Dyslexic Kids Face Difficulties in Distinguishing Speech from Noise
It has shown that dyslexic kids have a deficit in a brain mechanism involved in the perception of speech in a noisy environment.
The study provides the first direct evidence that the human auditory brainstem exhibits remarkable moment-to-moment plasticity and undergoes a fine-tuning that is strongly linked to noise exclusion.
Most people have little trouble carrying on a conversation with a friend in a noisy restaurant thanks to the highly adaptive auditory system, which manages to focus in on the predictable, repeating pitch of the friend's voice and effectively tune out the random, fluctuating background noise.
Although it may be a routine occurrence, exactly how the nervous system manages to accomplish this feat is still a mystery.
Senior study author Dr. Nina Kraus, who directs the Auditory Neuroscience Laboratory at Northwestern University, and colleagues measured auditory brainstem responses to a speech syllable presented in a repetitive or variable context in children with and without developmental dyslexia.
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