Varghese-Usha-2023

Authors: Varghese Peter, Usha Goswami, Denis Burnham, Marina Kalashnikova.

Article: Impaired neural entrainment to low frequency amplitude modulations in English-speaking children with dyslexia or dyslexia and DLD.

Publication: Brain and Language (Elsevier). Volume 236,105217 2023 | DOI: 10.1016/j.bandl.2022.105217

Highlights

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.

Abstract

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.

Tagged as: auditory processing, language processing, neural oscillations, neural synchronization, and temporal sampling

Citation:

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

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