Vagus Nerve Pulse After Practice Boosts Long-Term Motor Learning in Mice

A study from Tohoku University found that mice who received an electric current through their vagus nerve after training had better long-term motor learning. This discovery suggests there is a previously ignored period when the brain is still securing a new skill. It also hints that messages traveling from the body to the brain could help set the stage for lasting change.

One of the body’s main communication channels is the vagus nerve, which sends signals from internal organs to the brain and receives instructions from it in return. Scientists at Tohoku University, whose work focuses on super network brain physiology, demonstrated in mice that stimulating this nerve following training can reinforce long-term motor learning.

The Setup

To test vagus nerve stimulation (VNS), the researchers built a small cuff electrode meant to remain attached to the left cervical vagus nerve in mice. They then applied VNS during HOKR learning, a cerebellum-dependent eye movement task where mice learn to better track moving visual stripes. The task mirrors the automatic eye movements a person makes while standing on a platform and watching a train move past.

Not during the actual learning task, but after each training session, was when the stimulation was applied.

What Happened After Practice

There was no instant payoff from the treatment. Instead, the mice that got VNS showed greater long-term learning on the days that followed. That sequence points to a possible effect on processes that take place after training, during the period when the brain is turning what it has learned into lasting memory.

“The key point is that VNS was delivered only after training,” says Professor Ko Matsui. “Our findings suggest that VNS may open a hidden window of opportunity for enhanced learning by making the brain environment more receptive to long-lasting change.”

The Blood Vessel Signal

To see what changed inside the brain, the team turned their attention toward the cerebellar flocculus, a region tied to HOKR learning, and measured blood volume activity there.

The team used fiber photometry to track changes in blood volume during vagus nerve stimulation (VNS). A single round of VNS caused a two-part reaction: local blood volume dropped at first, then rose again with a delay. Repeating VNS brought about regular waves in blood volume.

The vascular rhythms were linked to learning too. Mice with bigger blood volume swings tended to show stronger learning by Day 5, which suggests that shifts in the brain’s blood vessel environment might be tied to the lasting effects of the stimulation.

“Our brains may be more strongly influenced by the body than we imagine,” says lead author Junyu Chen. “By tuning the brain’s metabolic environment, including rhythmic vascular movements, we may eventually unlock capacities that would otherwise remain latent.”

What Comes Next

Scientists aim to sharpen their understanding of the two-way communication pathway between brain and body through future research. This work will involve refining stimulation protocols and measuring more accurately how that connection sustains long-term plasticity. The goal is to reveal how learning becomes lasting and how the process behind it might eventually be strengthened.

The findings were published in iScience on August 25, 2026.

A new study has found that stimulating the vagus nerve creates rhythmic changes in blood vessels and improves long-term learning. The research was published in iScience on August 25, 2026. The authors were Junyu U. Chen, Yoko Ikoma, and Ko Matsui. The paper’s DOI is 10.1016/j.isci.2026.117413.

What the Study Found
– VNS delivered only after training, not during the task itself
– Stronger long-term learning in mice that received VNS
– Two-phase vascular response: brief decrease followed by rise
– Rhythmic oscillations with repeated VNS
– Larger blood volume oscillations tied to better learning by Day 5

The takeaway is that knowledge acquisition is not confined to the mind alone. Physical sensations feed back into the brain and determine how swiftly a skill takes hold, sometimes revealing openings for growth that had remained hidden.

Source material: “Vagus Nerve Stimulation Could Help New Skills Stick,” ScienceDaily.

brain science · learning · neuroplasticity · optokinetic response · vagus nerve