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Neural correlates of sleep-induced benefits on traumatic memory processing
Geraldine Gvozdanovic1,2, Sarah Schoch2, Philipp Stämpfli1
1Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland.
Human Brain Mapping
|March 31, 2023
Summary
Sleep after trauma, compared to sleep deprivation, reduces intrusive memories by enhancing brain consolidation. Targeted memory reactivation during sleep further aided this process, offering insights into preventing post-traumatic stress disorder.
Area of Science:
- Neuroscience
- Psychology
- Sleep Science
Background:
- Sleep is hypothesized to inhibit intrusive memory development after trauma.
- Neural mechanisms underlying sleep's effect on traumatic memory are not well understood.
- Targeted Memory Reactivation (TMR) may enhance memory consolidation during sleep.
Purpose of the Study:
- To investigate the neural correlates of sleep's effect on traumatic memory.
- To examine the impact of TMR during sleep on intrusive memories.
- To identify early neural predictors of intrusive memory development.
Main Methods:
- 110 healthy participants underwent a trauma film paradigm and implicit memory task.
- Functional magnetic resonance imaging (fMRI) recorded brain activity during sleep and wakefulness.
- TMR was used to reactivate traumatic memories during a nap.
Main Results:
- Sleep (nap) significantly reduced intrusive traumatic memories compared to wakefulness.
- TMR during sleep showed a descriptive reduction in intrusions.
- Post-wakefulness, trauma groups showed increased activity in cingulate and parietal cortex regions.
- Post-sleep, these regional differences diminished.
- Sleep increased activity in the cerebellum, hippocampus, amygdala, and other regions during memory retrieval.
- Hippocampal and amygdala activity predicted subsequent intrusions.
Conclusions:
- Sleep demonstrably benefits memory processing after experimental trauma, reducing intrusive memories.
- Specific brain regions (hippocampus, amygdala) show activity patterns that predict intrusive memories.
- Findings support the crucial role of sleep in preventing and treating post-traumatic stress disorder (PTSD).
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