The core neural atypicality in dyslexia involves reduced activation strength and an absence of typical age-related peak latency decreases, rather than a fundamental overall shift in peak latency.
Key Findings
Results
Children with dyslexia showed significant amplitude reductions compared to typically developing children in bilateral occipito-temporal and left superior temporal cortices during silent word reading.
Magnetoencephalography (MEG) was used to measure spatiotemporal neural responses during a silent reading task.
Stimuli varied in lexicality and frequency: high-frequency words, low-frequency words, and pseudowords.
Participants were children aged 7 to 12, comprising both typically developing (TD) and dyslexic developing (DD) groups.
Amplitude reductions in DD children were observed across bilateral occipito-temporal cortex and left superior temporal cortex.
These reductions were identified through direct between-group comparisons.
Results
Despite reduced signal amplitudes, the inter-hemispheric relationship of peak latencies in the dyslexic group remained consistent with the pattern observed in typically developing children.
Peak latency (PL) refers to the timing of neural responses measured by MEG.
The inter-hemispheric PL relationship was preserved in DD children despite amplitude differences.
This finding indicates that dyslexia does not involve a fundamental overall shift in peak latency timing.
The authors conclude that the timing architecture of the reading network is not globally disrupted in dyslexia.
Results
Within the typically developing group, older children exhibited decreased peak latencies in the left hemisphere, indicating age-related automatization of the reading network.
A clear relationship between age and peak latency was identified within the TD group.
Older typical readers showed shorter (decreased) peak latencies specifically in the left hemisphere.
This pattern was interpreted as reflecting the age-related automatization of the reading network.
The age range investigated was 7 to 12 years.
Results
The age-related decrease in peak latency observed in typically developing readers was absent in children with dyslexia across the entire investigated age range.
No significant relationship between age and peak latency was observed in the DD group.
This absence of the typical maturational pattern persisted across the full age range of 7 to 12 years.
The authors describe this as a 'functional atypicality that remains evident across the investigated age range.'
This finding distinguishes dyslexia from a simple developmental delay, as the typical age-related pattern did not emerge even in older DD children.
Results
No significant sensitivity to word frequency or lexicality was observed either within or between the groups during the silent reading task.
Stimuli included high-frequency words, low-frequency words, and pseudowords to probe lexicality and frequency effects.
Neither the TD nor the DD group showed significant neural differentiation based on word frequency or lexicality.
The authors attribute this null result to constraints of the silent reading paradigm used in the study.
This limits interpretation of frequency- and lexicality-related neural processing differences between groups.
What This Means
This research suggests that the brains of children with dyslexia respond differently to written words compared to typical readers, not primarily in the timing of responses, but in the strength of those responses. Using a brain-scanning technique called magnetoencephalography (MEG), researchers measured brain activity in children aged 7 to 12 while they silently read real words and made-up words. They found that children with dyslexia had weaker brain signals in regions associated with reading — specifically areas at the back and sides of the brain involved in recognizing visual word forms, and an area on the left side of the brain involved in language processing.
A particularly important finding concerns how the reading brain develops with age. In typically developing children, the brain's reading network became faster (showed shorter response times) as children got older, especially in the left hemisphere — a pattern consistent with reading becoming more automatic and efficient over time. This age-related speedup was entirely absent in children with dyslexia, and this difference was consistent across the whole 7-to-12 age range studied. This suggests that dyslexia is not simply a matter of being a slower developer who will eventually catch up, but rather involves a persistent difference in how the reading network matures.
Overall, this research suggests that the key neural markers of dyslexia are reduced brain signal strength during reading and a failure to develop the typical age-related increases in reading efficiency, rather than a wholesale shift in the timing of brain responses. These findings add to our understanding of what makes reading difficult for children with dyslexia and may help inform how researchers and clinicians think about the development and persistence of reading difficulties.
Samoylov I, Bolgina T, Lonshakov G, Shcheglova E, Gomozova M, Yashina T, et al.. (2026). Atypical neural activation and age-related patterns in dyslexia.. Cerebral cortex (New York, N.Y. : 1991). https://doi.org/10.1093/cercor/bhag122