Case Order Effects in Legal Decision-Making

Area of Science:

• Psychology
• Law
• Behavioral Economics

Background:

• Case order effects are documented in moral psychology but understudied in legal contexts.
• Legal systems emphasize consistency and precedent, making order effects a critical area for investigation.

Purpose of the Study:

• To investigate the presence and nature of case order effects within legal decision-making.
• To determine if psychological order effects extend to legal judgments and their implications for legal consistency.

Main Methods:

• Five studies (N=1023) presented participants with pairs of legal cases (positive and negative in isolation).
• The order of case presentation was manipulated (positive-negative vs. negative-positive).
• Included civil and criminal cases, with both individual and group decision-making.

Main Results:

• Case order effects were observed in legal decisions, mirroring findings in moral psychology.
• Effects were asymmetric: responses to one case were stable, while the other was labile based on presentation order.
• A novel finding showed labile case responses became less similar to preceding cases, contradicting existing theories.

Conclusions:

• Case order effects are readily triggered in legal decision-making, potentially influencing legal precedent.
• The asymmetric and novel direction of these effects challenges consistency-based theories and only partially aligns with salience-based theories.