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Updated: Feb 10, 2026
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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
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Odor-Cued Targeted Reactivation Was Unable to Selectively Benefit Declarative Memories During Sleep
Gautam Narayan1, George Babineaux2, Matthew Cho1
1Department of Neurobiology and Behavior and Center for the Neurobiology of Learning and Memory, University of California Irvine, Irvine, California, USA.
Journal of Sleep Research
|February 8, 2026
Summary
Targeted memory reactivation during sleep did not uniformly benefit specific memories. Memory reactivation effectiveness depends on initial encoding strength and may generalize across contexts.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Sleep Research
Background:
- Declarative memory consolidation occurs during sleep through reactivation.
- Real-world memories are often hierarchically structured.
- Targeted memory reactivation (TMR) uses sensory cues to selectively reactivate memories during sleep.
Purpose of the Study:
- To investigate the specificity of memory reactivation during sleep in humans.
- To determine if TMR benefits specific memory sets or broader learning contexts.
- To examine the influence of encoding strength on TMR effectiveness.
Main Methods:
- Thirty-two participants learned object locations paired with unique odors.
- One odor cue was presented during non-rapid eye movement (NREM) sleep.
- Behavioral performance and electrophysiological activity (sigma range) were assessed.
Main Results:
- No overall performance benefit was observed for the cued memory set compared to the non-cued set.
- A nuanced effect of encoding strength on reactivation was found.
- Odor presentation led to sustained sigma-band inhibition, contrary to previous findings of increased activity.
Conclusions:
- Memory reactivation during sleep may not exclusively benefit targeted memories.
- Cueing benefits might generalize across the entire learned context.
- Initial memory encoding strength is a critical factor influencing the effectiveness of sleep-based memory reactivation.
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