Functional MRI of mild traumatic brain injury (mTBI): progress and perspectives from the first decade of studies

Area of Science:

• Neuroscience
• Radiology
• Psychiatry

Background:

• Mild traumatic brain injury (mTBI) is a prevalent condition impacting cognitive function, vocational capacity, and quality of life.
• Functional MRI (fMRI) is a key research tool for understanding brain disorders, yet its application to mTBI is surprisingly limited.
• mTBI affects diverse populations, including military personnel, often with comorbid conditions like PTSD and depression.

Purpose of the Study:

• To critically review existing functional MRI (fMRI) research investigating brain alterations following mild traumatic brain injury (mTBI).
• To synthesize findings related to executive functions, memory, resting-state connectivity, and mTBI in military populations.
• To identify knowledge gaps and propose future directions for fMRI research in mTBI.

Main Methods:

• Comprehensive literature review of published fMRI studies on mTBI.
• Analysis of research focusing on specific cognitive domains (e.g., working memory, episodic memory).
• Examination of studies assessing resting-state functional connectivity and responses to interventions.

Main Results:

• fMRI studies have begun to reveal neuroanatomic substrates of cognitive deficits after mTBI.
• Research has explored mTBI effects on frontal lobe functions, memory, and functional connectivity.
• Studies in military populations address blast injury and co-occurring mental health conditions.

Conclusions:

• fMRI is a valuable tool for investigating mTBI pathophysiology, diagnosis, and treatment monitoring.
• Further research is needed to fully elucidate the role of fMRI in understanding and managing mTBI sequelae.
• Integrating fMRI with other methods will enhance future mTBI research and clinical applications.