Cognitive Evaluation as an Interface-Dependent Stress Test: Local Consistency, Global Non-Comparability, and Null Informational Spaces

This technical note examines cognitive evaluation as an interface-dependent process subject to structural limits of accessibility, comparability, and invertibility. Cognitive systems are treated exclusively as an illustrative domain, without advancing any cognitive theory, psychological model, or normative framework. The analysis shows that the absence of globally measurable performance does not imply the absence of information or competence within the interface-defined domain. Instead, such absences can arise from non-invertible or degenerate evaluation mappings that project locally coherent informational structures into null or collapsed observational spaces. The note makes no prescriptive claims and introduces no evaluation metrics, optimization objectives, or decision procedures. Its scope is strictly diagnostic: to characterize structural conditions under which evaluation fails due to interface-induced information loss rather than statistical uncertainty or data scarcity. By framing cognitive evaluation as a stress test for recognition interfaces, the note highlights general limits of global metrics and comparability that apply across complex systems, without implying universality, optimization, or improved evaluative performance.