Cognitive Inertia: The Mind in Defence of Its Own World

Abstract (175 words): Cognitive inertia is not the mind's failure to engage with the world honestly. It is the mind performing, with considerable precision, the function it was built to perform: protecting the coherence of an existing cognitive architecture at minimum metabolic cost. At its centre lies the reconstruction threshold: the point at which the cost of maintaining an existing cognitive structure, in the mind's own accounting, exceeds the cost of dismantling and rebuilding it. Below that threshold, evidence that contradicts load-bearing beliefs is processed, acknowledged, and systematically routed around the structures it would need to contact to produce genuine change. Above it, reorganisation becomes possible — not because the mind has become more open but because the existing architecture has become more expensive than what would replace it. Drawing on schema theory, dual-process models, identity-protective cognition research, and clinical evidence on belief revision, the argument reframes cognitive inertia from a problem of intellectual character to a structural feature of how minds manage mental resources under conditions of genuine uncertainty.