signal detection theory
Definition
Signal detection theory is a well-established analytical framework for separating two conceptually distinct aspects of judgment performance: discernment, the ability to accurately distinguish between signal and noise, and response bias, the overall tendency to respond in one particular direction regardless of the actual stimulus. Applied to misinformation research, the framework uses type-1 SDT measures, specifically sensitivity (d') and response criterion (C), to determine whether differences in accuracy between individuals reflect genuine discriminability or merely a shift toward caution or credulity. The framework can also be extended to metacognitive judgments through type-2 SDT, which yields parallel measures of metacognitive discernment and metacognitive response bias, capturing whether individuals can reliably distinguish their own correct responses from incorrect ones. In a study of 246 participants evaluating true and false news headlines, this approach revealed that intellectual humility predicted greater type-1 and type-2 discernment but was unrelated to response bias, with Bayesian analysis providing moderate support for the null hypothesis regarding the response-bias relationship.
Sources: Prike et al. (2024)
Related Terms
- misinformation (1 shared article)
- metacognition (1 shared article)
- intellectual humility (1 shared article)
Applications
Signal Detection Theory and Intellectual Humility
Applying signal detection theory to misinformation tasks allowed researchers to determine that intellectually humble individuals show higher sensitivity (d') rather than a conservative response criterion. Correlation coefficients between intellectual humility measures and type-1 d' ranged from r = .28 to r = .48, while Bayes Factors ranging from 0.17 to 0.43 supported the null hypothesis of no association with response bias (C).
Sources: Prike et al. (2024)
Signal Detection Theory and Misinformation Discernment
Signal detection theory separates genuine discernment of true and false claims from a blanket tendency to label information as false, a distinction that misinformation research has not always made explicit. The same analytic logic was used to demonstrate that intellectual humility improves discernment without inducing excessive skepticism toward all claims.
Sources: Prike et al. (2024)
Signal Detection Theory and Metacognitive Discernment
Type-2 signal detection theory extends the standard framework to metacognitive judgments, producing measures of how accurately individuals distinguish their own correct responses from incorrect ones. In the study, intellectual humility correlated positively with type-2 d' (r = .19 to .25), indicating that individuals higher in intellectual humility are better calibrated about the reliability of their own truthfulness judgments.
Sources: Prike et al. (2024)
