Coherence word12/4/2023 Further, stimulus length affects the speech–brain associations suggesting methodological approaches should be selected carefully when studying speech envelope processing at the neural level. Results highlight the importance of the lower frequencies for speech tracking in the brain across different lexical units. There was no difference between hemispheres at the source level either in coherence values for word or sentence processing or in evoked response to syllables. Both frequency bands showed an effect of stimulus type, although this was attributed to the length of the stimulus and not the linguistic unit size. Age-related differences were found for coherence values at the delta and theta frequency bands. We measured participants’ magnetoencephalogram (MEG) responses to syllables, words, and sentences, calculated the coherence between the speech signal and MEG responses at the level of words and sentences, and further examined auditory evoked responses to syllables. To disentangle those contributions, we studied the cortical tracking of various sized units of speech that are crucial for spoken language processing in children (4.7–9.3 years old, N = 34) and adults ( N = 19). Further, there is evidence that the two hemispheres contribute unequally to speech segmentation at the sentence and phonemic levels. In parallel, functional differences in brain development over time have been well documented and these differences may interact with changes in speech perception during infancy and childhood. Speech perception is dynamic and shows changes across development.
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