Resting State Dynamic Reconfiguration of Spatial Attention Cortical Networks and Visuospatial Functioning in...

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomedical Engineering

Background:

• Nonverbal learning disability (NVLD) is a neurodevelopmental disorder marked by visuospatial deficits and intact verbal skills.
• Identifying neurocognitive markers is crucial for establishing NVLD as a distinct disorder.
• Understanding the neural underpinnings of NVLD can inform diagnostic and therapeutic strategies.

Purpose of the Study:

• To investigate resting-state functional connectivity (rs-FC) in spatial attention networks in children with NVLD.
• To determine if rs-FC patterns can predict group membership (NVLD vs. typically developing).
• To explore the relationship between rs-FC and visuospatial performance in children with and without NVLD.

Main Methods:

• High-density electroencephalography (EEG) was used to measure rs-FC in 16 children with NVLD and 16 typically developing (TD) children.
• Cortical source modeling and graph theoretical measures were applied to analyze functional connectivity within the dorsal and ventral attention networks (DAN and VAN).
• A machine-learning approach was employed to predict group membership and visuospatial performance from EEG-derived rs-FC maps.

Main Results:

• EEG rs-FC maps in the gamma and beta bands differentiated children with and without NVLD.
• The NVLD group exhibited increased, more diffuse, and less efficient bilateral functional connections.
• Right dorsal attention network connectivity in the delta range predicted impaired visuospatial performance in the NVLD group, unlike in TD children.

Conclusions:

• Resting-state functional connectivity patterns in specific frequency bands can differentiate children with NVLD from TD children.
• NVLD is characterized by atypical and less efficient functional connectivity, particularly within right-hemisphere attention networks.
• These findings support the classification of NVLD as a distinct neurodevelopmental disorder with specific neurobiological markers.