Cortical language mapping in epilepsy: a critical review

Area of Science:

• Neurosurgery
• Neurology
• Neuroscience

Background:

• Epilepsy surgery requires balancing seizure control with preserving language function.
• Electrical stimulation mapping (ESM) was developed to identify critical language areas during surgery.
• Standardization and clinical validation data for ESM are currently limited.

Purpose of the Study:

• To review the literature on language organization patterns identified by ESM.
• To explore how patient characteristics influence these language patterns.
• To discuss the clinical validity, limitations, and future directions of ESM in epilepsy surgery.

Main Methods:

• Literature review of studies utilizing ESM for language mapping in epilepsy surgery patients.
• Analysis of topographical language organization patterns.
• Examination of patient factors (age, gender, bilingualism, pathology) affecting language mapping.

Main Results:

• ESM has generated data on brain-language relationships and topographical language organization.
• Patient characteristics can influence language lateralization and mapping outcomes.
• Despite limitations, ESM has likely prevented postoperative language deficits in many patients.

Conclusions:

• ESM is a valuable tool for mapping language during epilepsy surgery, despite lacking full standardization.
• Understanding patient-specific factors is crucial for interpreting ESM results.
• Further research is needed to fully establish the clinical validity and optimize ESM protocols.