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Related Experiment Video

Updated: Dec 24, 2025

Disrupting Reconsolidation of Fear Memory in Humans by a Noradrenergic β-Blocker
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Propofol Modulates Early Memory Consolidation in Humans.

Daa Un Moon1,2, Nazli Esfahani-Bayerl2, Carsten Finke1,3

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Summary

Early memory consolidation in the human brain is disrupted by propofol anesthesia administered shortly after learning. This neuro-pharmacological approach reveals critical early network changes for memory recall.

Keywords:
general anesthesiahippocampusmemory consolidationpropofolsynaptic consolidationsystems consolidation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Pharmacology

Background:

  • Memory consolidation involves synaptic stabilization and hippocampus-neocortex interactions.
  • The precise timing of network changes during memory consolidation is debated.
  • Limited methods exist to transiently interfere with human memory consolidation.

Purpose of the Study:

  • To investigate the temporal dynamics of memory consolidation using a neuro-pharmacological approach.
  • To explore the effects of propofol on early memory processing in humans.
  • To identify critical time windows for memory stabilization.

Main Methods:

  • A memory task involving word lists was administered to patients undergoing minor surgery.
  • Anesthetic doses of propofol were administered at different time points post-learning (13 min vs. 105 min).
  • Recall and recognition memory were assessed after awakening from anesthesia.

Main Results:

  • Propofol administration ~13 minutes post-learning impaired subsequent recall but not recognition.
  • Later propofol administration (~105 minutes post-learning) had no significant effect on memory.
  • These findings indicate rapid, time-sensitive changes in memory networks after learning.

Conclusions:

  • Memory networks undergo crucial, rapid changes very early after learning, impacting later recall.
  • Propofol anesthesia serves as a valuable tool to modulate early stages of hippocampus-dependent memory consolidation in humans.
  • This study provides insights into the temporal characteristics of memory consolidation in the human brain.