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Does infant memory expression reflect age at encoding or age at retrieval?

Kristin Hartshorn1, Carolyn Rovee-Collier

  • 1Department of Psychology, Rutgers University, Piscataway, NJ 08854-8020, USA.

Developmental Psychobiology
|March 7, 2003
PubMed
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Human infants demonstrate age-appropriate memory retrieval, showing that memory recall adapts to the infant's current age, not the age at which it was encoded. This developmental shift impacts how context influences memory recall.

Area of Science:

  • Developmental psychology
  • Cognitive neuroscience
  • Infant memory

Background:

  • Memory retention in infants is known to be highly context-dependent at 6 months of age.
  • This context dependency changes as infants mature to 8-9 months old.

Purpose of the Study:

  • To investigate whether infants express memories acquired at a younger age in a manner appropriate to their current age at retrieval.
  • To understand the developmental trajectory of context-dependent memory in human infants.

Main Methods:

  • Six-month-old infants learned an operant response in a specific context.
  • Memory was reinforced through monthly reinstatements in the original context.
  • At 8 or 9 months of age, infants were tested for memory recall in either the same or a different context.

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Main Results:

  • Infants tested at 8-9 months showed robust memory recall regardless of the testing context.
  • Memory retrieval was no longer dependent on the original encoding context at this later age.
  • This indicates that infants retrieve memories according to their current developmental stage.

Conclusions:

  • Infants' memory expression is appropriate to their age at retrieval, not encoding.
  • The functional significance of environmental context in memory recall changes as infants develop, particularly with the onset of self-locomotion.