V1+A1 → Associative → Prefrontal → Motor. Feedback connections.
V1, A1, Somatosensory, Association, dlPFC, Motor.
A→B→C→A cycle with laterals.
Central executive ↔ 4 modality spheres.
Two spheres, bidirectional.
Hemibrain connectome: 139,255 neurons across 10 brain regions (OL, CX, MB, INP, FB, VB, SIP, SLP, CRE, LH). Small-world topology with region-specific connectivity from published connectomics data.