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Implicit memories, also known as non-declarative memories, are long-term memories that function outside of conscious awareness. These memories influence behavior and skills without explicit knowledge. This type of memory is evident in tasks like playing tennis, snowboarding, and texting. Implicit memory has three subsystems: procedural memory, conditioning, and priming. This type of memory is essential in various activities, from everyday tasks to specialized skills.
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Related Experiment Video

Updated: Feb 28, 2026

Examining Recall Memory in Infancy and Early Childhood Using the Elicited Imitation Paradigm
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Nap-dependent declarative memory consolidation in 12-month-old infants - A conceptual replication study.

C Konrad1, S Schneider2, K Zinke3

  • 1Developmental Psychology, Faculty of Psychology, Ruhr University, Bochum, Germany.

Infant Behavior & Development
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

Infant naps are crucial for consolidating declarative memories. This study shows that 12-month-olds who napped after learning a new skill could recall it later, unlike those who stayed awake.

Keywords:
ImitationInfancyMemory consolidationNappingSleep

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Area of Science:

  • Developmental Psychology
  • Cognitive Neuroscience
  • Sleep Science

Background:

  • Declarative memory consolidation is vital for learning.
  • Previous research suggests sleep aids memory consolidation in adults.
  • The role of sleep in infant memory consolidation requires further investigation.

Purpose of the Study:

  • To replicate and extend findings on sleep-dependent declarative memory consolidation in 12-month-old infants.
  • To investigate the impact of post-learning sleep on infant memory recall.
  • To determine if naps facilitate the consolidation of newly acquired declarative memories in infants.

Main Methods:

  • Fifty-one 12-month-old infants were assigned to nap, wake, or control groups.
  • Declarative memory was assessed using deferred imitation paradigms.
  • Post-encoding sleep was monitored using polysomnography in the nap group.

Main Results:

  • Only infants who took a nap after learning demonstrated retention of target actions.
  • The average nap duration was 67 minutes.
  • A significant delay of 149 minutes occurred between learning and testing.

Conclusions:

  • Post-learning naps are critical for declarative memory consolidation in infants.
  • This sleep-dependent consolidation effect extends to various learning materials.
  • Findings underscore the importance of sleep for cognitive development in early childhood.