Hi-STMNA-GCN: A Hierarchical Spatio-Temporal Multi-Neighbor Graph Convolutional Network for Robust Alzheimer’s Disease Detection From fMRI Data

Neeti Sangwan,Veena Mittal,Deepak Sinwar,Navdeep Bohra

Published 2026 in IEEE Access

ABSTRACT

Early detection of Alzheimer’s Disease (AD), particularly at the Mild Cognitive Impairment (MCI) stage, is essential for effective intervention and disease management. Traditional deep learning models often struggle to simultaneously capture both local and global brain connectivity patterns from functional Magnetic Resonance Imaging (fMRI) data. To address these challenges, we propose the Hierarchical Spatio-Temporal Multi-Neighbour Aggregation Graph Convolutional Network (Hi-STMNA-GCN), a novel deep learning framework designed for robust AD classification. The Hi-STMNA-GCN model operates at two levels: at the Region Level, it employs multi-neighbour aggregation graph convolutional networks to comprehensively capture spatial dependencies by aggregating information from neighbouring nodes across multiple scales, while Gated Recurrent Units (GRU) effectively model the temporal dynamics of brain activity. At the Population Level, a hypergraph-based module is introduced to learn complex inter-subject relationships, enhancing the global discriminative power of the model. Additionally, a Masked Relation Learning (MRL) mechanism is integrated to prune redundant connections, ensuring that the most informative brain region interactions are preserved. Extensive experiments demonstrate that Hi-STMNA-GCN significantly outperforms existing methods, achieving classification accuracies of 96% (AD vs. Cognitively Normal (CN)), 94.8% (AD vs. MCI), and 98% (MCI vs. CN). These results highlight the model’s potential for early, reliable AD detection and its applicability in advancing neuroimaging-based diagnostic tools.

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