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Primacy and recency effects in rhesus monkeys (Macaca mulatta) using a serial probe recognition task. III. A
1Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA.
Developmental Psychobiology
|April 29, 1998
Summary
Young rhesus monkeys show a recency effect before a primacy effect, similar to children. Adolescent monkeys developed both memory effects after extensive training.
Area of Science:
- Cognitive Psychology
- Primate Behavior
- Neuroscience
Background:
- In human children, the recency effect in memory develops before the primacy effect.
- This developmental dissociation suggests distinct underlying cognitive mechanisms.
Purpose of the Study:
- To investigate if rhesus monkeys exhibit a similar developmental dissociation in memory effects.
- To compare the emergence of primacy and recency effects in adolescent and young adult rhesus monkeys.
Main Methods:
- A six-item serial probe recognition (SPR) task was administered to adolescent (21 months) and young adult (35 months) male rhesus monkeys.
- Performance was analyzed to identify the presence and development of primacy and recency effects.
Main Results:
- Young adult monkeys demonstrated both primacy and recency effects.
- Adolescent monkeys initially showed only the recency effect, acquiring the primacy effect after prolonged training (26 months).
Conclusions:
- Rhesus monkeys, like human children, show a developmental dissociation where the recency effect precedes the primacy effect.
- This finding supports theories suggesting delayed maturation of specific brain systems (neocortical, hippocampal, cholinergic) may underlie this dissociation in memory development.
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