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Updated: May 31, 2026
Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
Prior Nighttime Sleep and Face Recognition in 6- and 12-Month-Old Infants
Gulizar Tel1, Sabine Seehagen1
1Faculty of Psychology, Ruhr University Bochum, Bochum, Germany.
Insights
Nighttime sleep quality impacts infant memory encoding. Better sleep efficiency and light sleep in 6-month-olds, and light sleep and co-sleeping in 12-month-olds, predicted better recognition of angry faces.
Area of Science:
- Developmental Psychology
- Neuroscience
- Sleep Science
Background:
- The role of sleep, especially nighttime sleep, in infant memory encoding is not well understood.
- Infant memory development and its relationship with sleep patterns require further investigation.
Purpose of the Study:
- To explore the association between nighttime sleep parameters and memory encoding in infants.
- To investigate age-specific differences in sleep's impact on memory in the first year of life.
Main Methods:
- Assessed sleep patterns of 6- and 12-month-old infants using actigraphy and sleep diaries.
- Administered a visual recognition memory task involving emotional and neutral facial expressions the following day.
- Utilized correlation and hierarchical regression analyses to examine relationships between sleep and memory.
Main Results:
- Twelve-month-olds, unlike 6-month-olds, recognized emotional (happy, angry) but not neutral faces.
- In 6-month-olds, sleep efficiency and light sleep predicted novelty preference for angry and neutral faces.
- In 12-month-olds, light sleep and co-sleeping predicted novelty preference for angry faces.
Conclusions:
- Specific sleep parameters have age-dependent effects on memory encoding in infants.
- Nighttime sleep quality influences the ability to encode emotional facial expressions in early development.
Abstract:
The role of prior sleep, particularly nighttime sleep, in memory encoding is poorly understood in infants. The present study, therefore, focused on possible associations between nighttime sleep and memory encoding in the first year of life. First, the sleeping behavior of 6-month-old (n = 32) and 12-month-old (n = 35) infants was assessed for one night using actigraphy and sleep diaries. The following day, infants participated in a visual recognition memory task in the laboratory, which included photographs of female adults showing happy, angry, and neutral facial expressions. Six-month-old infants did not recognize any of the faces, whereas 12-month-old infants recognized the emotional, but not neutral faces, as indicated by novelty preference scores. Correlation and hierarchical regression analyses revealed that sleep efficiency and light sleep predicted novelty preference scores for angry and neutral faces in 6-month-olds, whereas light sleep and co-sleeping predicted novelty preference scores for angry faces in 12-month-olds. These results suggest that specific sleep parameters have distinct and age-specific significance for subsequent memory encoding.
