Abstract: This systematic review examines how neutrosophic logic has been applied in psychology and behavioral science, with particular attention to the representation of psychological indeterminacy through the Truth, Indeterminacy, and Falsity triad. Following a PRISMA-based search strategy, records were identified from Scopus, Web of Science, PubMed, PsycINFO, Google Scholar, ResearchGate, and specialized neutrosophic sources. After screening and eligibility assessment, 30 studies were included in the qualitative synthesis. The reviewed literature indicates that neutrosophic approaches have been used mainly in psychological assessment, behavioral decision-making, clinical diagnostic support, sentiment/perception analysis, and theoretical modeling of ambivalence. The findings suggest that neutrosophic tools may complement classical and fuzzy approaches by explicitly modeling neutrality, hesitation, contradiction, and incomplete information. However, the current evidence remains uneven, with many studies being conceptual, computational, or preliminary rather than clinically validated. Future research should prioritize empirical validation, transparent reporting, reproducible tools, and accessible software for researchers and practitioners.
Keywords: Neutrosophic Logic; Neutropsyche; Human Behavior; Indeterminacy; Systematic Review; Psychometrics; Cognitive Dissonance; Decision-Making; PRISMA; TIF Triad
Publication Date: 2026-06-14