Early visual word processing in children with ADHD: An ERP study.

Zhang et al. (2024) hooked up kids with ADHD and same-age peers to an EEG cap. They flashed real Chinese characters on a screen and watched the N170 wave. This brain wave shows the first moment the visual system says "hey, that’s print."

The team wanted to know if ADHD brains mark print as special as early as typical brains do.

The N170 stayed small and sluggish in the ADHD group. Their brains did not give the quick, sharp response that makes reading fast and automatic.

Typical readers showed the usual jump, confirming the brain had tagged the symbols as words.

Vojnits et al. (2024) saw the same kind of neural lag in teenagers with ADHD, but during sleep. Slower sleep spindles pointed to delayed brain maturation. Together the two 2024 papers paint a picture: ADHD brains run on “slow clock” settings day and night.

Megnin et al. (2012) and Wagner et al. (2025) found similar weak early waves in autism, just in sound instead of print. The pattern crosses senses and diagnoses—early sensory tagging is fragile in several neurodevelopmental conditions.

Manning et al. (2026) flips the coin: in autistic kindergarteners, bigger early ERPs to speech sounds predicted better later word reading. That seems opposite to Wenfang’s negative finding, but the difference is timing and skill. Wenfang links a smaller N170 to reading risk; L links a larger P1/P2 to reading gain. Both say the same thing—early neural size matters for literacy.

If the N170 is blunted, printed words never get the brain’s fast-track label. Kids may lean on slow letter-by-letter decoding and tire quickly. You can’t fix the wave yet, but you can add supports that bypass it: larger fonts, extra spacing, color highlighting, and repeated exposure to build whole-word templates. Track reading fluency weekly; when progress stalls, check vision and print clarity first—those tweaks help the weak N170 do its job.