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Enhanced recognition memory following vagus nerve stimulation in human subjects
K B Clark1, D K Naritoku, D C Smith
1Department of Psychology, Southern Illinois University, Carbondale 62901-6502, USA.
Nature Neuroscience
|April 9, 1999
Summary
Vagus nerve stimulation after learning significantly improved verbal memory retention in epilepsy patients. This confirms that activating the vagus nerve enhances memory formation, similar to arousal effects observed in rodents.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Arousal-related neuromodulators impact learning and memory.
- Many neuromodulators cannot easily cross the blood-brain barrier.
- In rodents, vagus nerve activation by neuromodulators influences memory.
Purpose of the Study:
- To investigate if vagus nerve stimulation enhances human verbal learning and memory.
- To extend findings from rodent models to human subjects.
Main Methods:
- Examined word-recognition memory in epilepsy patients undergoing vagus nerve stimulation.
- Administered vagus nerve stimulation (VNS) after a learning task.
Main Results:
- Post-learning vagus nerve stimulation significantly improved memory retention.
- Demonstrated a positive effect of VNS on human verbal memory.
Conclusions:
- Vagus nerve activation enhances memory formation in humans.
- Findings support the hypothesis that vagus nerve stimulation modulates memory similarly to arousal.
