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Using the Visual World Paradigm to Study Sentence Comprehension in Mandarin-Speaking Children with Autism

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Spectrotemporal cortical dynamics and semantic control during sentence completion.

Tim Coolen¹, Alexandru Mihai Dumitrescu², Vincent Wens²

¹Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium; Université Libre de Bruxelles, Hôpital Universitaire de Bruxelles (HUB), CUB Hôpital Erasme, Department of Radiology, Brussels, Belgium.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology

|May 7, 2024

Summary

Sentence completion (SC) involves distinct brain oscillations, particularly in the left inferior frontal gyrus and asymmetric temporal lobe activity, influenced by semantic control load.

Keywords:

Brain Oscillations Language Mapping Magnetoencephalography Semantic Control Sentence Completion

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Area of Science:

Neuroscience
Cognitive Neuroscience
Brain Imaging

Background:

The semantic control network (SCN) is crucial for language processing.
Understanding the neural dynamics of semantic control is essential for diagnosing and treating language disorders.

Purpose of the Study:

To investigate cortical oscillations during a sentence completion task (SC) using magnetoencephalography (MEG).
To examine the role of the semantic control network (SCN), its lateralization, and the impact of semantic control load.

Main Methods:

Twenty right-handed adults performed SC with low (LC) and high (HC) cloze stimuli during MEG.
Analyzed spectrotemporal power modulations (ERS/ERD) across the whole brain and in SCN regions (pMTG/ITG, IFG) under varying semantic control loads.

Main Results:

Identified three cortical response patterns: early occipital theta-band ERS, intermediate SCN alpha/beta-band ERD, and late dorsal language stream alpha/beta/gamma-band ERD.
High semantic control load (LC) revealed prolonged left pMTG/ITG engagement (ERD) and right-sided inhibition (ERS).
Left IFG showed increased late beta-band ERD with higher semantic control load (LC vs. HC).

Conclusions:

Sentence completion relies on distinct cortical responses, including left IFG activation and asymmetric pMTG/ITG engagement for semantic control.
These findings support the use of SC in neuromagnetic preoperative language mapping and understanding language disorders.