Neuroanatomy Reflects Individual Variability in Impulsivity in Youth

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Individual differences in neural circuits are linked to psychiatric disorders.
• Impulsivity, characterized by unplanned reactions and poor response inhibition, varies across individuals.
• Understanding the neurobiological underpinnings of impulsivity is crucial for identifying at-risk youth.

Purpose of the Study:

• To explore the neural bases of impulsivity in a large cohort of youth.
• To investigate associations between impulsivity and neuroanatomical features (cortical thickness, surface area, gray matter volume).
• To examine sex-specific differences in the neuroanatomy-impulsivity relationship over time.

Main Methods:

• Utilized multivariate brain-based predictive models on data from the Adolescent Brain Cognitive Development (ABCD) Study.
• Analyzed neuroanatomical data (cortical thickness, surface area, gray matter volume) from 9,099 youth at baseline and 6,432 at follow-up.
• Assessed impulsivity across multiple behavioral scales.

Main Results:

• Significant associations were found between impulsivity and neuroanatomical variability.
• Impulsivity mapped to cortical thickness in regions like the inferior frontal and superior frontal cortex.
• Associations between neuroanatomy and impulsivity varied across behavioral scales, neuroanatomical features, and showed sex-specific patterns.

Conclusions:

• Neuroanatomy is a key driver of individual differences in impulsivity in youth.
• Neuroanatomical markers may help identify youth at risk for impulsivity-related disorders.
• A multidimensional and sex-specific approach is essential for neuroimaging and behavioral research on impulsivity.