Order effects in contingency learning: the role of task complexity.

Area of Science:

• Cognitive Psychology
• Human Learning
• Causal Inference

Background:

• Contingency learning research shows conflicting results regarding primacy and recency effects.
• A primacy effect occurs when early evidence has a greater impact on judgments than later evidence.
• A recency effect occurs when later evidence has a greater impact than earlier evidence.

Purpose of the Study:

• To investigate the psychological mechanisms underlying primacy and recency effects in contingency learning.
• To propose and test a hypothesis that initial evidence anchors causal judgments, leading to a primacy effect.
• To identify factors that moderate the exhibition of primacy effects in contingency learning.

Main Methods:

• Two experiments were conducted to examine contingency learning under varying task complexities.
• Experiment 1 manipulated the number of outcomes to be learned (one vs. two).
• Experiment 2 assessed the correlation between the primacy effect and participants' verbal working memory capacity.

Main Results:

• A significant primacy effect was observed when participants learned contingencies involving a single outcome.
• No primacy effect was found when participants learned contingencies involving two outcomes, suggesting reduced influence of initial evidence.
• The magnitude of the primacy effect was positively correlated with verbal working memory capacity.

Conclusions:

• Task complexity, specifically the number of contingencies to be learned, is a critical moderator of the primacy effect.
• Interference with initial hypothesis development due to task complexity likely explains the absence of a primacy effect in more complex conditions.
• Individual differences in verbal working memory capacity may influence the ability to overcome anchoring effects in contingency learning.