Action processing and mirror neuron function in patients with amyotrophic lateral sclerosis: an fMRI study

Area of Science:

• Neuroscience
• Cognitive Science
• Neurology

Background:

• Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease.
• Social cognition, including theory of mind (ToM), may be impaired in ALS.
• Neural mechanisms underlying potential ToM deficits in ALS remain under-investigated.

Purpose of the Study:

• To investigate the neural underpinnings of social cognition, specifically ToM, in ALS patients.
• To assess mirror neuron system (MNS) function during action processing in ALS.
• To examine differences in brain activity and behavioral performance between ALS patients and healthy controls.

Main Methods:

• Functional magnetic resonance imaging (fMRI) to measure BOLD activity during action execution/observation and action understanding tasks.
• Behavioral assessment using the Reading the Mind in the Eyes test (RME).
• Comparison of brain activity and performance between 19 ALS patients and 18 healthy controls.

Main Results:

• ALS patients exhibited increased BOLD activity in right anterior cortical regions, including MNS areas, during action processing, suggesting compensation.
• Healthy controls showed better behavioral performance in action understanding and greater prefrontal cortex/middle temporal gyrus activation.
• Action understanding performance correlated with RME scores, differentiating ALS patient subgroups.

Conclusions:

• A subset of ALS patients may experience social cognition and ToM impairments.
• These deficits may be linked to altered functioning of the MNS and related neural networks involved in action processing.
• Findings highlight the need for further research into social cognition in ALS and its neural basis.