Impaired novelty processing in apathy after subcortical stroke

Area of Science:

• Neuroscience
• Neurology
• Cognitive Science

Background:

• Apathy is a common behavioral symptom following stroke, impacting cortical and subcortical regions.
• It is characterized by reduced novelty-seeking behaviors.
• Understanding the neural underpinnings of apathy post-stroke is crucial for effective management.

Purpose of the Study:

• To investigate the relationship between apathy and neural orienting responses to novel events in subcortical stroke patients.
• To utilize event-related evoked potential (ERP) techniques to examine these neural responses.

Main Methods:

• Twenty-nine subcortical ischemic stroke patients were categorized into apathetic and nonapathetic groups.
• Apathy was assessed using the modified Starkstein apathy score.
• Auditory P3 event-related evoked potential (ERP) components, including target P3 and novelty P3, were analyzed.

Main Results:

• Apathetic patients exhibited lower scores in verbal fluency and global cognitive function tests.
• The apathetic group showed prolonged novelty P3 latency and reduced frontal amplitude.
• Apathy scores correlated with novelty P3 latency and amplitude at the frontal site, while target P3 related to cognitive function.

Conclusions:

• Apathy post-subcortical stroke is associated with impaired neural processing of novel events within the frontal-subcortical system.
• Novelty P3 serves as a valuable physiological marker for assessing apathy in stroke survivors.
• Findings highlight the utility of ERPs in understanding and quantifying apathy after stroke.