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Understanding why some new skills are easy to learn while others are frustratingly difficult, even with repeated practice, goes beyond just talent and effort. It also involves whether your brain is in the optimal state for transforming practice into lasting learning.
Learning is not isolated from the rest of your body. Your internal organs continuously send signals to your brain through the vagus nerve, a key communication channel in your nervous system. Researchers at Tohoku University, specializing in supernetwork brain physiology, found that stimulating this nerve after training can enhance long-term motor learning in mice. This sheds light on the vital role of body-to-brain communication in helping new skills stick.
The results of the study were published in Science on August 25, 2026.
The Vagus Nerve and Learning
The vagus nerve acts as a vital conduit between the brain and the body, transmitting signals from internal organs to the brain and vice versa. Scientists can manipulate this pathway through vagus nerve stimulation (VNS), which is already approved for treating various conditions.
While past studies have focused on VNS as a way to modulate neurotransmitter activity, recent research indicates that rhythmic changes in brain blood vessels could play a key role.
To explore this possibility, researchers developed a cuff electrode to attach to the left cervical vagus nerve of mice. They then tested VNS during horizontal optomotor response (HOKR) learning, a task that teaches mice to track moving visual stripes, akin to watching a passing train.
Post-Practice Benefits
When VNS was applied after each training session, it did not immediately boost performance during the training. However, mice that received VNS showed enhanced long-term learning the following day. This suggests that VNS may impact the brain’s post-training processes, aiding in the consolidation of learned information into lasting memories.
According to Professor Ko Matsui, “VNS post-training seems to create an opportunity to enhance learning by providing a conducive brain environment for change over time.”
Rhythmic Blood Volume Changes
Researchers also analyzed brain changes associated with improved learning, monitoring blood volume activity near the cerebellar hair bundle involved in HOKR learning.
Through fiber photometry, they observed a two-step vascular response to a single VNS event, with temporary blood volume decrease followed by an increase. Repeated VNS led to rhythmic blood volume oscillations, correlating with improved learning by day 5.
Lead author Junyu Chen suggests, “Our bodies may have a greater influence on our brains than we realize. Adjusting the brain’s metabolic environment through blood vessel movement could potentially unlock untapped potential.”
Exploring Brain-Body Communication
Future research aims to fine-tune stimulation protocols and delve deeper into how brain-body communication sustains long-term plasticity. By studying this bidirectional pathway, scientists hope to gain insights into how learning persists and strengthens over time.
Source: www.sciencedaily.com
