Stability of brain potentials, mental abilities, and cortical thickness

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Understanding the factors influencing brain potential variability is crucial for insights into cognitive function.
• Previous research has explored age-related changes in brain activity, but trial-to-trial variability remains less understood.

Purpose of the Study:

• To investigate the relationship between trial-to-trial amplitude variation of P3a and P3b brain potentials and age.
• To examine correlations between this variability and measures of intelligence (verbal and performance abilities).
• To explore associations between variability and brain volumetry, specifically cortical thickness.

Main Methods:

• 133 participants completed neuropsychological testing and an event-related potential (ERP) task.
• A subgroup of 72 participants underwent magnetic resonance imaging (MRI) for brain volumetry.
• Statistical analyses were performed to assess correlations between ERP variability, age, intelligence, and brain structure.

Main Results:

• Trial-to-trial P3a amplitude variation positively correlated with age.
• This variability showed negative correlations with both verbal and performance intelligence.
• Negative correlations were found between variability and cortical thickness in the temporoparietal junction and precentral gyrus, modulated by age.

Conclusions:

• Intraindividual variability in brain potentials is significantly associated with age, cognitive abilities, and specific brain regions.
• These findings suggest that intraindividual variability is a valuable metric for studying central nervous system function.
• The results highlight the importance of considering variability in neuroscientific research and clinical assessments.