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The conjunction effect: new evidence for robustness.

Stephanie Stolarz-Fantino¹, Edmund Fantino, Daniel J Zizzo

¹University of California, San Diego, USA.

The American Journal of Psychology

|April 25, 2003

Summary

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The conjunction effect, where people deem combined events more likely than individual ones, is a robust cognitive bias. Interventions like feedback or framing did not significantly alter this common reasoning error.

Area of Science:

Cognitive Psychology
Decision Making
Behavioral Economics

Background:

The conjunction effect, or conjunction fallacy, is a well-documented cognitive bias.
This bias occurs when individuals judge the probability of a conjunction of two events to be higher than the probability of one of the constituent events.

Purpose of the Study:

To investigate the robustness of the conjunction effect under various experimental conditions.
To examine the influence of feedback, incentives, and contextual framing on the occurrence of the conjunction fallacy.

Main Methods:

Synthesized findings from five independent studies examining the conjunction effect.
Manipulated factors including feedback, monetary reinforcement, contextual framing (logic vs. opinion questions), and statement position.

Related Experiment Videos

Assessed participant judgments on conjunction problems involving two or three simple statements.

Main Results:

Neither feedback nor monetary reinforcement significantly impacted performance on conjunction problems.
The context of the problem presentation and the location of the conjunction statement influenced the effect's occurrence.
The conjunction effect persisted even without framing descriptions and with incentives for accuracy.

Conclusions:

The conjunction effect demonstrates considerable robustness, persisting across different conditions and interventions.
Cognitive biases like the conjunction fallacy may be resistant to simple corrective measures.
Understanding the contextual and positional factors influencing this bias is crucial for cognitive research.