Domain‐general and domain‐specific functional networks of Broca's area underlying language processing

Bulut, Talat

doi:10.1002/brb3.3046

Cited by 6 publications

(2 citation statements)

References 153 publications

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“…Multiple roles have been previously attributed to the IFG during speech perception, including syntactic processing, semantic processing and phonological working memory (Bulut, 2023; Enge et al, 2020; Friederici, 2011; Perrachione et al, 2017). Admittedly, activation of the IFG has also been reported during music perception, however, recent metanalyses and clinical studies suggest this effect is right lateralized (Asano et al, 2022; Chen et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

Anatomically distinct cortical tracking of music and speech by slow (1-8Hz) and fast (70-120Hz) oscillatory activity

Osorio,

Assaneo

2024

Preprint

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Music and speech encode hierarchically organized structural complexity at the service of human expressiveness and communication. Carefully controlled experiments have suggested that populations of neurons in cortical auditory regions track temporal modulations within rhythmic acoustic signals, physiologically supporting perception of both music and speech. However, whether cortical tracking of music and speech extends to less controlled (i.e., naturalistic) signals remains contentious. Here, we investigated whether cortical tracking can be observed under more natural perceptual scenarios, and how stimulus type, frequency band or anatomical localization modulates this effect. We analyzed intracranial recordings from 30 subjects while they passively watched a movie where visual scenes were accompanied by either music or speech stimuli. Cross-correlation between brain and acoustic signals, along with density-based clustering analyses and linear mixed effect modeling, revealed both anatomically overlapping and functionally distinct mapping of the tracking effect as a function of stimulus type and frequency band. We observed widespread tracking of music and speech signals in the Slow Frequency Band (1-8Hz), with near zero temporal lags and high mixed-selectivity. In contrast, High Frequency Band (70-120Hz) tracking was higher during speech perception, was more densely concentrated in classical language processing areas, and showed a clear frontal-to-temporal gradient in lag values that was not observed during perception of musical stimuli. Our results highlight the recruitment of domain-general and domain-specific mechanisms during perception of naturalistic music and speech signals, as well as a complex interaction between cortical region and frequency band that shapes temporal dynamics during processing of hierarchically organized temporal structures in speech.

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Section: Discussionmentioning

confidence: 99%

Anatomically distinct cortical tracking of music and speech by slow (1-8Hz) and fast (70-120Hz) oscillatory activity

Osorio,

Assaneo

2024

Preprint

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“…Second, subregions of the Broca's area can be functionally separated into a language-specific region and a domain-general region, such as working memory 49,50 .…”

Section: Discussionmentioning

confidence: 99%

Asymmetrical sequence chunking for auditory and visual domains in the left and right hemispheres

Ding,

Lu,

et al. 2023

Preprint

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Chunking is an effective mechanism to process sensory sequences. It remains unclear, however, whether the chunking mechanism is domain-general or specific to each input sensory modality. Here, we investigate the functions of the Broca’s area and its right homolog mediating chunking when human participants break up auditory and visual sequences into chunks based on rules. Using magnetoencephalography (MEG), we demonstrate that neural activity can track the rhythms of sensory chunks across the brain areas. Critically, the precision of chunk-tracking activity in the left and right inferior frontal gyri (IFG) separately predicts the behavioral performance for auditory and visual chunking. Transcranial magnetic stimulation (TMS) further reveals that deactivating the left and right IFG distinctively influences the behavioral performance of auditory and visual chunking. Additionally, structural imaging shows that the strength of the left and right arcuate fasciculi, connecting frontal and temporal cortices, predicts both ipsilateral IFG activation and modality-dependent chunking performance. The consistent electrophysiological, neural modulation and structural connectivity results collectively suggest distinct hemispherical lateralized temporal-frontal networks for rule-based chunking in the auditory and visual domains.

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Domain‐general and domain‐specific functional networks of Broca's area underlying language processing

Bulut

2023

Brain and Behavior

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Introduction Despite abundant research on the role of Broca's area in language processing, there is still no consensus on language specificity of this region and its connectivity network. Methods The present study employed the meta‐analytic connectivity modeling procedure to identify and compare domain‐specific (language‐specific) and domain‐general (shared between language and other domains) functional connectivity patterns of three subdivisions within the broadly defined Broca's area: pars opercularis (IFGop), pars triangularis (IFGtri), and pars orbitalis (IFGorb) of the left inferior frontal gyrus. Results The findings revealed a left‐lateralized frontotemporal network for all regions of interest underlying domain‐specific linguistic functions. The domain‐general network, however, spanned frontoparietal regions that overlap with the multiple‐demand network and subcortical regions spanning the thalamus and the basal ganglia. Conclusions The findings suggest that language specificity of Broca's area emerges within a left‐lateralized frontotemporal network, and that domain‐general resources are garnered from frontoparietal and subcortical networks when required by task demands.

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Domain‐general and domain‐specific functional networks of Broca's area underlying language processing

Cited by 6 publications

References 153 publications

Anatomically distinct cortical tracking of music and speech by slow (1-8Hz) and fast (70-120Hz) oscillatory activity

Anatomically distinct cortical tracking of music and speech by slow (1-8Hz) and fast (70-120Hz) oscillatory activity

Asymmetrical sequence chunking for auditory and visual domains in the left and right hemispheres

Domain‐general and domain‐specific functional networks of Broca's area underlying language processing

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