A Functional MRI Paradigm Suitable for Language and Memory Mapping in Pediatric Temporal Lobe Epilepsy

Area of Science:

• Neuroimaging
• Pediatric Neurology
• Epileptology

Background:

• Functional Magnetic Resonance Imaging (fMRI) is vital for identifying critical brain regions, particularly language areas, for pre-surgical planning in temporal lobe epilepsy (TLE).
• While language fMRI is common, memory fMRI is underutilized in adult TLE and absent in pediatric TLE, creating a gap in pre-surgical assessment for children.

Purpose of the Study:

• To develop and evaluate a novel, combined language and memory fMRI paradigm suitable for children undergoing evaluation for pediatric TLE.
• To provide clinically relevant functional brain mapping for surgical planning in pediatric TLE patients.

Main Methods:

• A combined language/memory fMRI paradigm was developed and tested in 28 healthy children (aged 8-18 years).
• The paradigm assesses both memory encoding and recall-related neural networks, utilizing recall-based retrieval to engage the hippocampus.
• Overt verbal responses were used to monitor in-scanner memory performance.

Main Results:

• The novel fMRI paradigm successfully mapped language and memory networks in healthy children.
• The paradigm's design allows for simultaneous assessment of both cognitive functions within a single session.
• It enables evaluation of memory encoding and recall, with recall-based tasks engaging hippocampal networks.

Conclusions:

• This innovative fMRI paradigm is suitable for pediatric TLE, offering valuable insights into language and memory network function.
• It addresses the need for comprehensive pre-surgical functional mapping in pediatric epilepsy surgery.
• Parallel paradigm versions facilitate pre- and post-surgical intervention comparisons of brain activity.