Socioeconomic status, white matter, and executive function in children

Area of Science:

• Neuroscience
• Developmental Psychology
• Pediatrics

Background:

• Socioeconomic status (SES) is linked to children's brain structure, but its specific relation to white matter structure is less understood.
• While SES affects brain areas supporting executive functions (EF), the role of white matter in this relationship is unclear.
• Research explores whether white matter differences mediate SES disparities in EF or if SES moderates brain-behavior links.

Purpose of the Study:

• To investigate socioeconomic disparities in children's white matter macrostructure and microstructure.
• To examine the relationship between family SES, white matter integrity in EF-related tracts, and EF task performance.

Main Methods:

• Analysis of a diverse sample of 1082 children and adolescents (ages 3-21).
• Assessment of socioeconomic status (SES) and its association with white matter volume and fractional anisotropy (FA).
• Investigation of EF performance, including cognitive flexibility, working memory, and inhibitory control.

Main Results:

• SES was associated with fractional anisotropy (FA) and volume in multiple white matter tracts.
• Family income moderated the relationship between white matter structure and cognitive flexibility.
• Lower white matter FA or volume correlated with reduced cognitive flexibility in lower-income children, while higher-income children maintained cognitive flexibility.

Conclusions:

• Childhood socioeconomic contexts shape not only cognitive functioning and neurobiology but also brain-behavior relationships.
• Findings suggest that SES influences how white matter structure relates to cognitive flexibility.
• This research contributes to understanding the neurobiological underpinnings of socioeconomic disparities in cognitive development.