Neuroimaging patterns associated with motor control in traumatic brain injury

Area of Science:

• Neuroscience
• Neuroimaging
• Rehabilitation Medicine

Background:

• Traumatic brain injury (TBI) frequently results in motor deficits.
• Understanding the neural underpinnings of motor recovery after TBI is crucial for developing effective rehabilitation strategies.

Purpose of the Study:

• To investigate functional brain activation differences in patients with TBI and motor deficits during repetitive hand movements compared to healthy controls.
• To identify predictors of motor outcome within functional brain activation maps of TBI patients.

Main Methods:

• Exploratory cross-sectional study utilizing functional magnetic resonance imaging (fMRI).
• Blood-oxygenation-level-dependent (BOLD) response was measured in cortical motor areas during unilateral fist-clenching in 34 TBI patients and healthy controls.
• A subset of 12 TBI patients was rescanned after approximately 4 months to assess changes over time.

Main Results:

• TBI patients demonstrated reduced fMRI signal change in the primary sensorimotor cortex (cSM1), dorsal premotor cortex, and supplementary motor areas (SMAs) compared to controls.
• A negative correlation was observed between clinical impairment and fMRI signal magnitude in cSM1 and SMA.
• Baseline fMRI signal decrease in cSM1 was associated with poor clinical outcome in TBI patients.

Conclusions:

• The magnitude of fMRI signal change in the cSM1 region shows potential as a prognostic indicator for motor recovery in TBI patients.
• Functional brain imaging may offer valuable insights for predicting outcomes and guiding treatment in TBI rehabilitation.