Dissociating prosodic from syntactic delta activity during natural speech comprehension

Current Biology, Год журнала: 2024, Номер 34(15), С. 3537 - 3549.e5

Опубликована: Июль 23, 2024

Decoding human speech requires the brain to segment incoming acoustic signal into meaningful linguistic units, ranging from syllables and words phrases. Integrating these constituents a coherent percept sets root of compositional meaning hence understanding. One important cue for segmentation in natural is prosodic cues, such as pauses, but their interplay with higher-level processing still unknown. Here, we dissociate neural tracking pauses multi-word chunks using magnetoencephalography (MEG). We find that manipulating regularity disrupts slow speech-brain bilaterally auditory areas (below 2 Hz) turn increases left-lateralized coherence higher-frequency activity at onsets (around 25-45 Hz). Critically, also chunks-defined short, bundles inter-word dependencies-are processed through rhythmic fluctuations low-frequency independently cues. Importantly, alignment chunk accuracy an encoding model bilateral frontal while controlling effect acoustics. Our findings provide novel insights basis perception, demonstrating both features (prosodic cues) abstract timescale are underpinned by electrophysiological delta frequency range.

Язык: Английский

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Neural representation of sensorimotor features in language-motor areas during auditory and visual perception

Communications Biology, Год журнала: 2025, Номер 8(1)

Опубликована: Янв. 11, 2025

Speech processing involves a complex interplay between sensory and motor systems in the brain, essential for early language development. Recent studies have extended this sensory-motor interaction to visual word processing, emphasizing connection reading handwriting during literacy acquisition. Here we show how language-motor areas encode motoric features of stimuli auditory perception, using functional magnetic resonance imaging (fMRI) combined with representational similarity analysis. Chinese-speaking adults completed tasks involving perception spoken syllables written characters, alongside syllable articulation finger writing localize speech-motor writing-motor areas. We found that both generally production-related across modalities, indicating cooperative interactions systems. Notably, encoding within sensorimotor was observed speech but not character perception. These findings underscore dual capacities areas, revealing shared distinct neural representation patterns which may be linked innate mechanisms modality-specific demands. Our results shed light on integration underlying highlighting importance cross-modality perspective. A comparison RSA modeling fMRI data reveals representations modalities

Язык: Английский

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Utilizing machine and deep learning algorithms to identify learning-related features in electroencephalography data during second language acquisition

Cogent Arts and Humanities, Год журнала: 2025, Номер 12(1)

Опубликована: Апрель 25, 2025

Язык: Английский

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Entrainment echoes in the cerebellum

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(34)

Опубликована: Авг. 13, 2024

Evidence accumulates that the cerebellum's role in brain is not restricted to motor functions. Rather, cerebellar activity seems be crucial for a variety of tasks rely on precise event timing and prediction. Due its complex structure importance communication, human speech requires particularly predictive coordination neural processes successfully comprehended. Recent studies proposed cerebellum indeed major contributor processing, but how this contribution achieved mechanistically remains poorly understood. The current study aimed reveal mechanism underlying cortico-cerebellar demonstrate speech-specificity. In reanalysis magnetoencephalography data, we found aligned rhythmic sequences noise-vocoded speech, irrespective intelligibility. We then tested whether these "entrained" responses persist, they interact with other regions, when stimulus stopped temporal predictions had updated. only intelligible produced sustained cerebellum. During "entrainment echo," during itself, was coupled left inferior frontal gyrus, specifically at rates corresponding preceding rhythm. This finding represents evidence specific cerebellum-driven processing their relay cortical regions.

Язык: Английский

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Entrainment echoes in the cerebellum

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Март 7, 2024

Summary Historically, researchers have considered the cerebellum a coordinator of motor programs that ensures precise timing movements and their adaptation to external events 1 . However, it has become increasingly clear this role is not restricted system 2 Rather, seems play an important in temporal prediction general, as shown its involvement multiple functions rely on event 3 Although previous work suggested exclusively predicts interval between two 4 , rather than tracking global rhythm, also active when rhythmic stimulus changes rate 5 The latter finding line with cerebellar speech processing 6 entails frequent 7 Neural mechanisms underlying cerebellum’s processing, however, remain poorly understood. Moreover, there lack studies contrasting non-speech stimuli establish speech-specificity observed effects 8 In re-analysis magnetoencephalography (MEG) data 9 we found activity aligned sequences noise-vocoded speech, irrespective intelligibility. We then tested whether these “entrained” responses persist, how they interact other brain regions, stopped predictions had be updated. only intelligible produced outlasted stimulus. During “entrainment echo”, but during itself, was coupled left inferior frontal gyrus (IFG), specifically at rates corresponding preceding rhythm. This represents unprecedented evidence for specific cerebellum-driven relay cortical regions.

Язык: Английский

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Dissociating endogenous and exogenous delta activity during natural speech comprehension

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Фев. 1, 2024

Decoding human speech requires the brain to segment incoming acoustic signal into meaningful linguistic units, ranging from syllables and words phrases. Integrating these constituents a coherent percept sets root of compositional meaning hence understanding. One important cue for segmentation in natural are prosodic cues, such as pauses, but their interplay with higher-level processing is still unknown. Here we dissociate neural tracking pauses multi-word chunks using magnetoencephalography (MEG). We find that manipulating regularity disrupts slow speech-brain bilaterally auditory areas (below 2 Hz) turn increases left-lateralized coherence higher frequency activity at onsets (around 25 - 45 Hz). Critically, also defined short, bundles inter-word dependencies processed through rhythmic fluctuations low independently cues. Importantly, low-frequency alignment chunk accuracy an encoding model bilateral frontal areas, while controlling effect acoustics. Our findings provide novel insights basis perception, demonstrating both features (prosodic cues) abstract timescale underpinned by electrophysiological activity.

Язык: Английский

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Frequency-specific cortico-subcortical interaction in continuous speaking and listening

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Март 8, 2024

Abstract Speech production and perception involve complex neural dynamics in the human brain. Using magnetoencephalography (MEG), our study explores interaction between cortico-cortical cortico-subcortical connectivities during these processes. Our connectivity findings speaking revealed a significant connection from right cerebellum to left temporal areas low frequencies, which displayed an opposite trend high frequencies. Notably, high-frequency was absent listening condition. These underscore vital roles of connections within speech network. The results new enhance understanding brain processes, emphasizing distinct frequency-based interactions various regions.

Язык: Английский

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Compensatory Mechanisms for Preserving Speech-in-Noise Comprehension Involve Prefrontal Cortex in Older Adults

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Март 13, 2024

Abstract The capacity of comprehending others amidst noise is essential for human communication. However, it presents significant challenges the elderly who often face progressive declines in peripheral auditory system and whole brain. While previous studies have suggested existence neural reserve compensation as potential mechanisms preserving cognitive abilities aging, specific supporting speech-in-noise comprehension among remain unclear. To address this question, present study employs an inter-brain neuroscience approach by analyzing coupling between brain activities older adults those speakers under noisy conditions. Results showed that encompassed more extensive regions listeners compared to young listeners, with a notable engagement prefrontal cortex. Moreover, from cortex was coordinated classical language-related regions. More importantly, background increases, listener’s speech performance closely associated Taken together, reveals compensatory recruitment neurocognitive resources, particularly within cortex, facilitate processing aging brain, further highlights critical role maintaining elderly’s ability comprehend environments. It supports hypothesis, extending knowledge about basis underlies preservation population.

Язык: Английский

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Frequency-specific cortico-subcortical interaction in continuous speaking and listening

eLife, Год журнала: 2024, Номер 13

Опубликована: Май 17, 2024

Speech production and perception involve complex neural dynamics in the human brain. Using magnetoencephalography, our study explores interaction between cortico-cortical cortico-subcortical connectivities during these processes. Our connectivity findings speaking revealed a significant connection from right cerebellum to left temporal areas low frequencies, which displayed an opposite trend high frequencies. Notably, high-frequency was absent listening condition. These underscore vital roles of connections within speech network. The results new enhance understanding brain processes, emphasizing distinct frequency-based interactions various regions.

Язык: Английский

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Frequency-specific cortico-subcortical interaction in continuous speaking and listening

Опубликована: Май 17, 2024

Speech production and perception involve complex neural dynamics in the human brain. Using magnetoencephalography (MEG), our study explores interaction between cortico-cortical cortico-subcortical connectivities during these processes. Our connectivity findings speaking revealed a significant connection from right cerebellum to left temporal areas low frequencies, which displayed an opposite trend high frequencies. Notably, high-frequency was absent listening condition. These underscore vital roles of connections within speech network. The results new enhance understanding brain processes, emphasizing distinct frequency-based interactions various regions.

Язык: Английский

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