A Systems-Level Review of Identity-Threat in Scientific Reasoning

Resistance to disconfirming evidence is often attributed to deficits in information, reasoning, or integrity. This systems-level review advances a different account: that evidence resistance, when beliefs are tightly coupled to identity, reflects a state-dependent biological constraint rather than an epistemic failure. Integrating findings from cognitive neuroscience, stress physiology, and endocannabinoid system (ECS) biology, the paper proposes that identity-threatening information recruits stress-regulation pathways evolved to preserve stability under threat. Under acute and resolvable challenge, ECS-mediated buffering supports recovery and adaptive belief updating. Under chronic, unresolved identity threat, repeated buffering produces allostatic load, narrowing cognitive flexibility and converting evidentiary escalation into additional regulatory stress. In this state, more evidence does not improve correction and may intensify resistance. The review reframes ego-defensive cognition and belief rigidity as emergent properties of predictive biological systems operating under sustained regulatory demand, rather than as failures of intelligence, education, or ethics. It further demonstrates why evidence-based correction often stalls or backfires in high-stakes scientific, clinical, and institutional contexts where identity, reputation, and authority are at risk. This paper forms part of the Context-Dependent Cannabinoid Risk and Endocannabinoid System Integrity series (DOI: 10.5281/zenodo.18273628). Within that framework, it contributes a non-pharmacological extension of ECS allostasis, showing that persistent identity-linked cognition can function as an endogenous stressor that recruits the same buffering mechanisms implicated in context-dependent cannabinoid risk. Together, the series establishes a unified load-aware model in which outcomes are determined not by inputs alone, but by regulatory state, adaptive reserve, and context. The work is explicitly descriptive rather than prescriptive. It makes no clinical, diagnostic, or therapeutic claims, and does not pathologise identity, ego, or resistance itself. Instead, it aims to clarify the biological limits under which scientific reasoning, clinical decision-making, and governance systems operate, providing a foundation for more resilient, adaptive, and state-aware approaches to evidence and correction.