Primacy in causal strength judgments: the effect of initial evidence for generative versus inhibitory relationships

Area of Science:

• Cognitive Psychology
• Causal Inference

Background:

• Information order significantly impacts human judgment and inference.
• Causal learning relies on interpreting covariation evidence.

Purpose of the Study:

• To investigate the effect of evidence order on causal strength judgments.
• To examine the primacy effect in causal induction.

Main Methods:

• Experiments presenting covariation evidence in different orders (generative vs. inhibitory).
• Assessing judged causal strength after evidence presentation.
• Controlling for potential confounds like fatigue and trial number.

Main Results:

• Initial presentation of generative evidence (joint presence/absence) led to higher causal strength judgments.
• This primacy effect persisted across multiple trials and was not due to fatigue.

Conclusions:

• The order of evidence presentation, specifically the primacy of generative information, influences causal judgments.
• Current contingency-based and associative theories do not adequately explain this observed primacy effect in causal induction.