Authors: Varghese Peter, Usha Goswami, Denis Burnham, Marina Kalashnikova.
Publication: Brain and Language (Elsevier). Volume 236,105217 2023 | DOI: 10.1016/j.bandl.2022.105217
- • We studied auditory steady state responses (ASSR) at 2, 5, 8 Hz in 7-to-12-year-olds.
- • Half the sample had dyslexia or dyslexia and developmental language disorder (DLD).
- • Children with dyslexia/dyslexia with DLD had reduced ASSRs at 2 Hz.
- • Stimulation at 2 Hz corresponds to the rate of stressed syllables across languages.
- • Neural rhythmic responding at 2 Hz is atypical in dyslexia/dyslexia with DLD.
Neural synchronization to amplitude-modulated noise at three frequencies (2 Hz, 5 Hz, 8 Hz) thought to be important for syllable perception was investigated in English-speaking school-aged children. The theoretically-important delta-band (∼2Hz, stressed syllable level) was included along with two syllable-level rates. The auditory steady state response (ASSR) was recorded using EEG in 36 7-to-12-year-old children. Half of the sample had either dyslexia or dyslexia and DLD (developmental language disorder). In comparison to typically-developing children, children with dyslexia or with dyslexia and DLD showed reduced ASSRs for 2 Hz stimulation but similar ASSRs at 5 Hz and 8 Hz. These novel data for English ASSRs converge with prior data suggesting that children with dyslexia have atypical synchrony between brain oscillations and incoming auditory stimulation at ∼ 2 Hz, the rate of stressed syllable production across languages. This atypical synchronization likely impairs speech processing, phonological processing, and possibly syntactic processing, as predicted by Temporal Sampling theory.
Varghese Peter, Usha Goswami, Denis Burnham, Marina Kalashnikova,
Impaired neural entrainment to low frequency amplitude modulations in English-speaking children with dyslexia or dyslexia and DLD,
Brain and Language, Volume 236, 2023, 105217