Children Show Stronger Learning-Dependent Explicit Knowledge Than Adults After Offline Wake or Sleep Intervals.

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Sleep Research

Background:

• Procedural memory consolidation after learning is influenced by post-training sleep and wakefulness.
• Research on how offline processes affect explicit and implicit procedural memory components in children and adults yields controversial results.
• Understanding developmental differences in memory consolidation is crucial for cognitive science.

Purpose of the Study:

• To investigate age-related differences in the consolidation of procedural skills and explicit knowledge in children and adults.
• To examine the impact of sleep versus wakefulness on offline memory consolidation and explicit knowledge acquisition.
• To clarify the role of time-dependent mechanisms versus sleep-dependent mechanisms in procedural memory development.

Main Methods:

• A Serial Reaction Time Task was used to teach a visuo-motor sequence to 42 children and 58 young adults.
• Participants experienced either a nocturnal sleep or daytime wakefulness interval (~11 hours) between learning and retest.
• Explicit sequence knowledge was measured using the Process Dissociation Procedure (PDP), alongside online and offline performance assessments.

Main Results:

• Both children and adults demonstrated comparable offline performance improvements, irrespective of the sleep or wakefulness interval.
• Children exhibited significantly higher explicit knowledge of the sequence compared to adults, independent of the offline interval condition.
• Children showed a consistent shift from online performance deterioration to improvement across both sleep and wake conditions.

Conclusions:

• Time-dependent mechanisms, rather than differential effects of sleep versus wakefulness, primarily drive procedural memory consolidation and explicit knowledge development in children.
• A developmental dissociation exists between age-invariant offline consolidation of procedural skills and the more robust development of explicit knowledge in children.
• Findings suggest that while the skill consolidation process is similar across development, the resulting explicit knowledge formation differs significantly between children and adults.