Sulcal depth in prefrontal cortex: a novel predictor of working memory performance

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Cognitive Neuroscience

Background:

• Neuroanatomical changes are key to cognitive development.
• Tertiary sulci are human-specific, develop late, and are promising for studying cognitive skills like working memory (WM).
• The relationship between sulcal morphology and WM is not well understood.

Purpose of the Study:

• To investigate the link between lateral prefrontal cortex (LPFC) sulcal depth and verbal WM in children and adolescents.
• To determine if sulcal morphology predicts WM performance independently of age.

Main Methods:

• A data-driven approach with cross-validation was used.
• Analyzed sulcal depth in the LPFC of 60 children and adolescents (ages 6-18).
• Correlated sulcal depth with verbal WM performance, controlling for age.

Main Results:

• Nine left LPFC sulci, primarily tertiary, significantly predicted verbal WM performance.
• This predictive model surpassed models based on age or cortical thickness.
• Most predictive sulci were located in or near established LPFC functional regions.

Conclusions:

• Tertiary sulcal depth in the LPFC is a significant predictor of verbal WM in developing individuals.
• Findings support the theory that tertiary sulci act as developmental landmarks for higher-order cognitive functions.
• This research provides empirical evidence for the neuroanatomical basis of protracted cognitive development.