Primacy Effect

What is the primacy effect?

The primacy effect is an advantage for information presented early in a sequence. In free-recall memory tasks, it means better recall of the first items than of many middle items. The term is also used for greater influence of early information on judgments, which is a separate outcome from recall.

Murdock documented the early-item advantage in word-list recall. Glanzer and Cunitz found that presentation rate changed recall at the beginning of a list differently from recall at its end. Such results support explanations involving learning and retrieval conditions.

Primacy effect example

If people recall the first few words in a studied list better than words in the middle, that illustrates a primacy effect in memory.

Primacy in memory and judgment

In Asch’s impression-formation research (1946), one group heard these traits in order: intelligent, industrious, impulsive, critical, stubborn, envious. Another group heard the same six traits in reverse order. The intelligence-first description generally produced an impression of a capable person with shortcomings; the envy-first description gave those shortcomings a more negative role in the overall impression.

This measured how people evaluated a person, not which words they could recall. The information was held constant while its order changed. For decisions, comparing the full evidence against explicit criteria is a practical check; this study did not test it as a guaranteed cure for order effects.

Sources: The serial position effect of free recall; Two storage mechanisms in free recall.