Illumination Onset as Calibrated Instability: Bottom-Up Dominance in Affective–Embodied Neural Hierarchies

Graham Wallas (1926) described illumination as sudden and involuntary, yet its mechanism remained unclear. This paper reconceptualized the onset of illumination as a calibrated threshold breach within a metastable, affective–embodied predictive hierarchy operating near the edge of chaos. Insight was proposed to arise when descending precision relaxed, bottom-up sensory and affective signals gained dominance, and accumulated prediction error exceeded regulatory containment. Pre-onset metastability was characterized by reduced frontal stabilization, alpha–beta withdrawal, heightened salience responsiveness, and escalating instability without loss of coherence. Threshold crossing occurred as temporally compressed gamma synchronization reorganized distributed representations into a new attractor configuration, producing irreversible hierarchical updating. Illumination onset was structurally compared with epileptic seizure onset to clarify boundary conditions. Both exhibited anticipatory buildups followed by abrupt transitions; the divergence lay in calibration. Illumination reflected constrained synchronization that preserved integrative structure, whereas seizure reflected runaway hypersynchrony following regulatory failure. Creativity thus occupied a narrow regime closer to instability than to order. The “Aha!” moment was reframed as a biologically grounded dominance shift—an affective–embodied reorganization in which instability approached chaos closely enough to force restructuring while remaining regulated enough to preserve coherence.