Neurodevelopmental oscillatory basis of speech processing in noise

Humans' extraordinary ability to understand speech in noise relies on multiple processes that develop with age. Using magnetoencephalography (MEG), we characterize the underlying neuromaturational basis by quantifying how cortical oscillations in 144 participants (aged 5-27 years) track phrasal and syllabic structures in connected speech mixed with different types of noise. While the extraction of prosodic cues from clear speech was stable during development, its maintenance in a multi-talker background matured rapidly up to age 9 and was asso-ciated with speech comprehension. Furthermore, while the extraction of subtler information provided by syl-lables matured at age 9, its maintenance in noisy backgrounds progressively matured until adulthood. Altogether, these results highlight distinct behaviorally relevant maturational trajectories for the neuronal sig-natures of speech perception. In accordance with grain-size proposals, neuromaturational milestones are reached increasingly late for linguistic units of decreasing size, with further delays incurred by noise.

Automated summary

Humans' ability to understand speech in noise develops with age through multiple processes. Using MEG, researchers studied cortical oscillations in 144 participants (aged 5-27 years) to understand how they track phrasal and syllabic structures in connected speech mixed with different types of noise. The study found that while the extraction of prosodic cues from clear speech remains stable during development, its maintenance in a multi-talker background matures rapidly up to age 9 and is associated with speech comprehension. The study also found that the extraction of subtler information provided by syllables matures at age 9, but its maintenance in noisy backgrounds progressively matures until adulthood.