FusedNeXt-based anxiety detection from electroencephalography topographic maps: A comparative analysis of alpha, beta, and theta bands

Figure 4 Detailed internal structure of a representative FusedNeXt stage, showing block A (spatial-mixing; equations 5-7) and block B (channel-mixing; equations 8-10) with their two parallel paths and additive hyper-connection (⊕) fusion points. Block A combines a 3 × 3 depthwise-convolution path (P₁) with a 1 × 1 grouped-convolution path (P₂) and fuses them by element-wise addition followed by batch normalization. Block B combines a transformer-style inverted-bottleneck path (M; 1 × 1 grouped expansion → GELU → 1 × 1 projection) with a complementary 3 × 3 grouped-convolution path (R), again fused by element-wise addition followed by batch normalization. The two additive fusions form the hyper-connection points of the stage, allowing features from spatial and channel transformation paths to be combined within a shared representation space. GELU: Gaussian Error Linear Unit.