Deep Symbolic Stabilization in Sri Lanka; A DSSM-Based Archaeological and Cognitive Synthesis from the Pleistocene to State Society

Sri Lanka occupies a theoretically decisive position in global prehistory. Despite lacking early agriculture, writing, or monumentality, the island preserves one of the longest continuous records of symbolic behavior by anatomically modern humans outside Africa. This paper applies the Deep Symbolic Systems Model (DSSM) to Sri Lankan archaeology from the Late Pleistocene through the emergence of historic polities, demonstrating that symbolic stabilization occurred by at least 28,000–18,000 BP and persisted for millennia prior to state formation. Using DSSM’s four diagnostic criteria—intergenerational repetition, spatial constraint, cross-media redundancy, and persistence under stress—this study evaluates each major archaeological phase. Results reveal a “persistent forager–mnemonic pathway” to symbolic saturation, driven by cave-based mnemonic architectures, standardized portable symbolic anchors, and landscape memory. Comparative analysis shows that Sri Lanka reaches full DSSM saturation earlier than Egypt, Mesopotamia, the Indus Valley, East Asia, or Mesoamerica, despite the absence of canonical civilizational markers. Monumentality and writing appear only during the Anuradhapura period, consistent with DSSM predictions. Sri Lanka thus provides a strong empirical validation of DSSM and necessitates refinement of global symbolic evolution models beyond agriculture-centric frameworks.