Around 7% of children—four boys for every girl—struggle to learn to read and write despite normal intelligence and senses, a condition called dyslexia. This matters because the root causes of dyslexia remain poorly understood, leaving diagnosis reliant on observing reading failure after it has already set in. The research proposes a specific sensory mechanism: that dyslexic children have difficulty perceiving the abruptness of sound onsets—the difference between a sharp trumpet note and a smooth violin note. This impairs the brain’s ability to lock its natural oscillatory rhythms to the incoming speech signal, disrupting the tracking of syllable-level modulations crucial for understanding speech and hearing rhythm in music. If the team confirms this sensory deficit using behavioural tests and brain imaging, the impact could be twofold. First, it would provide early biomarkers—neural signatures of processing difficulty—to identify at-risk children before reading problems emerge. Second, it would suggest that interventions based on music, poetry, and nursery rhymes, which train the perception of low-frequency modulations, could be beneficial early in development. This is fundamental science with a clear translational path: better understanding of cause could lead to better educational programmes for children with dyslexia.
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Around 7% of children have specific problems in acquiring reading and writing skills, with a ratio of 4:1 boys:girls. When there is no obvious sensory, neural or educational basis, this learning difficulty is called dyslexia. The causes of dyslexia are poorly understood, but some features are common across different languages. One is difficulties in phonological tasks like counting the number of syllables in words and deciding whether words rhyme. Another is difficulty in distinguishing how rapidly sounds begin - dyslexics find it difficult to distinguish the abruptness of onset of sounds, for example a note played by a trumpet (sharp onset or ?rise time?) vs a violin (more extended onset or ?rise time?). We think these difficulties with phonology and rise time are linked, because the brain uses the onsets of sounds to define where the modulation (the important frequency and amplitude information) is in speech. The brain also uses sound onsets to reset the oscillation patterns of groups of brain cells that track the incoming acoustic signal by locking their oscillatory frequency to this signal. If the perception of sound onsets is impaired, then this tracking mechanism would not work as efficiently in a dyslexic brain. Some of these cell networks are driven by syllable-level fluctuations in the incoming signal, which means they are driven by lower frequency modulations. These low frequency modulations are crucial for speech intelligibility and are also important for hearing rhythm in music and syllable stress in speech. Our current rise time data suggest that children with dyslexia find both hearing metrical structure in music and syllable stress in speech difficult. In our work, we will test whether the brains of children with dyslexia have a specific difficulty in perceiving these low frequency modulations, using a variety of behavioural and brain imaging approaches. If we find that there is this proposed sensory/neural difficulty in dyslexia, then interventions based on music and metrical language (like poetry and nursery rhymes) may be very beneficial early in development for enriching this kind of auditory perception. We hope to improve our understanding of the causes of dyslexia through this research, and to find biomarkers (specific neural signatures of processing difficulty) that could help identify children at risk early in life. If the factors we propose turn out to be important, they will also help us in designing better educational programmes for children with dyslexia.
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