Attenuated error-related potentials in amyotrophic lateral sclerosis with executive dysfunctions

Area of Science:

• Neuroscience
• Neurology
• Cognitive Science

Background:

• Executive dysfunction affects up to 50% of amyotrophic lateral sclerosis (ALS) patients, negatively impacting prognosis and quality of life.
• Motor impairments in ALS can hinder the assessment of executive functions using traditional neuropsychological methods.
• Event-related potentials (ERPs) offer a potential solution due to minimal motor requirements for recording.

Purpose of the Study:

• To investigate the utility of error(-related) negativity (N_e/ERN) amplitudes as a measure of executive dysfunction in ALS.
• To compare N_e/ERN amplitudes between ALS patients and healthy controls.
• To explore the relationship between N_e/ERN amplitudes and executive function performance in ALS.

Main Methods:

• Compared response-synchronized ERP amplitudes on error trials of a flanker task in 18 ALS patients and 19 healthy controls.
• Assessed executive functions using standardized neuropsychological measures.
• Analyzed the correlation between N_e/ERN amplitudes and executive function scores.

Main Results:

• While general ERP amplitudes were unaffected by ALS, a significant relationship was found between N_e/ERN amplitudes and executive functions.
• ALS patients with poorer executive functioning exhibited attenuated N_e/ERN amplitudes.
• This suggests N_e/ERN reflects ALS-associated executive impairment.

Conclusions:

• N_e/ERN amplitudes may serve as a sensitive marker for executive dysfunction in ALS.
• Potential neural underpinnings involve disturbances in networks including the anterior cingulate cortex.
• N_e/ERN assessment offers a cost-efficient, non-invasive method for evaluating executive function in ALS.