The Role of the Dorsolateral Prefrontal Cortex for Speech and Language Processing

Area of Science:

• Neuroscience
• Linguistics
• Cognitive Science

Background:

• The dorsolateral prefrontal cortex (DLPFC) is increasingly recognized for its involvement in language processing.
• Its precise role, especially in pragmatic aspects, remains an active area of research.

Purpose of the Study:

• To review the language processing functions associated with the DLPFC.
• To examine its connectivity with language networks and other functional systems.
• To explore the clinical implications of DLPFC dysfunction in communication.

Main Methods:

• Literature review of studies investigating DLPFC function in language.
• Analysis of neuroimaging and lesion studies.
• Consideration of functional connectivity between the DLPFC and language-related networks.

Main Results:

• The DLPFC contributes to pragmatic language functions, including discourse management, prosody integration, nonliteral meaning interpretation, inference, ambiguity resolution, and error repair.
• It acts as a critical hub for functional connectivity between language networks and other cortical and subcortical circuits.
• Damage to the DLPFC results in psychiatric communication deficits, distinct from typical aphasia.

Conclusions:

• The DLPFC is integral to higher-level language processing, particularly pragmatics.
• Its role in integrating information across networks highlights its importance in complex communication.
• The DLPFC represents a potential therapeutic target for pragmatic language disorders.