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Published on: March 1, 2022
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Sensitivity to Evidential Dependencies in Judgments Under Uncertainty.
1School of Psychology, University of New South Wales Sydney.
Cognitive Science
|May 17, 2022
Summary
People often struggle to distinguish between independent and dependent testimony, even when it impacts their judgments. Only a minority correctly weigh evidence based on its source, aligning with Bayesian predictions.
Area of Science:
- Cognitive Psychology
- Decision Science
- Social Cognition
Background:
- Bayesian models posit independent testimony holds greater evidential weight than dependent testimony.
- Understanding how individuals process testimony from multiple sources is crucial for judgment and decision-making.
- Learners' sensitivity to the evidential value of testimony based on its dependency is not well-understood.
Purpose of the Study:
- To investigate whether individuals can differentiate between the evidential value of independent versus dependent testimony.
- To examine how learners update their beliefs when presented with evidence from multiple informants.
- To determine if individuals' prior beliefs about evidence influence their weighting of testimony.
Main Methods:
- Employed a social version of the balls-and-urns task across three experiments.
- Participants judged the likelihood of an urn being the source of evidence based on informant testimony.
- Informants provided either independent testimony (own observations) or dependent-sequential testimony (considered prior testimonies).
Main Results:
- Participants generally showed insensitivity to the evidential dependency of testimony in belief updating (Experiments 1 and 2).
- A subset of participants, who believed independent evidence was more valuable, correctly weighted independent testimony more heavily (Experiment 3).
- Findings indicate a minority of individuals align with Bayesian predictions regarding testimony evaluation.
Conclusions:
- Sensitivity to the distinction between independent and dependent testimony is limited in the general population.
- Beliefs about the relative value of evidence types can predict how individuals weigh testimony.
- Further research is needed to understand the cognitive mechanisms underlying testimony evaluation under uncertainty.
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