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Updated: Jan 24, 2026
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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
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Electrical Synapses Contribute to Sleep-Dependent Declarative Memory Retention
Gordon B Feld1,2,3,4,5,6, Niels Niethard5,7, Jianfeng Liu5
1Clinical Psychology, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany.
The European Journal of Neuroscience
|January 23, 2026
Summary
Electrical synapses are crucial for consolidating verbal memories during sleep. Blocking these connections with mefloquine impaired memory retention and disrupted sleep oscillations in healthy men.
Area of Science:
- Neuroscience
- Sleep Science
- Memory Research
Background:
- Sleep is vital for memory consolidation, but the underlying neurophysiological mechanisms, particularly the role of electrical synapses (gap junctions), remain unclear.
- Electrical synapses facilitate direct neuronal communication, potentially influencing brain oscillations during sleep.
Purpose of the Study:
- To investigate the role of electrical synapses in sleep-dependent memory consolidation.
- To determine if blocking electrical synapses affects verbal declarative and sensorimotor memory retention.
Main Methods:
- Healthy young men received mefloquine (blocks electrical synapses) or placebo before sleep, wakefulness, or after sleep.
- Memory retention for word pairs and sensorimotor sequences was assessed.
- EEG recordings analyzed sleep spindle and slow oscillation coupling.
- Rat models examined hippocampal sharp-wave/ripple activity.
Main Results:
- Mefloquine administration before sleep impaired verbal declarative memory retention and disrupted the coupling of sleep spindles to slow oscillations.
- Memory retention was unaffected when mefloquine was given before wakefulness or after sleep.
- Sensorimotor memory retention was enhanced by mefloquine, independent of sleep.
- Mefloquine did not alter hippocampal sharp-wave/ripple activity in rats.
Conclusions:
- Electrical synapses specifically support the sleep-dependent consolidation of verbal declarative memory.
- Electrical coupling enhances oscillatory coordination between sleep spindles and slow oscillations, crucial for memory consolidation.
- Mefloquine's effects on sensorimotor memory suggest distinct consolidation pathways.
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