Home›Neurology› taVNS Improves Memory in Rodent Stroke Models With Large Pooled Effect
taVNS Improves Memory in Rodent Stroke Models With Large Pooled EffectVagus Nerve Stimulation May Improve Memory After Stroke
Frontiers in MedicinePublished September 14, 2026DOI ↗Editorial oversight: Dr. Ji-eun Park, MD · Brain, Mind & Pain
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Key Takeaway
Interpret taVNS memory benefits cautiously: rodent data only, no human evidence.
This meta-analysis synthesized preclinical evidence on transcutaneous auricular vagus nerve stimulation (taVNS) in rodents with experimental stroke models. The scope was limited to memory function, assessed by escape latency in the Morris water maze and the Barnes maze, across 158 rodents. The comparator, setting, and follow-up duration were not reported.
The pooled analysis found that taVNS significantly improved memory function, with a standardized mean difference of 1.85 (95% CI 1.06 to 2.64). No absolute numbers were reported. The authors did not report secondary outcomes, adverse events, tolerability, or discontinuations.
Limitations were not listed in the source data, but the evidence is confined to animal models and does not directly translate to human clinical outcomes. Funding and conflicts of interest were not reported, and no certainty assessment was provided.
For clinicians, these findings are hypothesis-generating only. They do not support the use of taVNS for memory impairment after stroke in humans, and no practice relevance was stated by the authors. The large effect size should be interpreted with caution given the preclinical nature, small sample, and absence of safety data.
How this fits prior evidence
This preclinical meta-analysis extends prior coverage of post-stroke interventions, such as adjunctive acupoint application for post-stroke sleep disorders, by examining a noninvasive neuromodulation approach for memory function in rodent models. It contrasts with human studies covered previously, including intravenous thrombolysis in extended windows and microembolic signals on TCD, which address acute stroke outcomes rather than cognitive recovery. The findings are not directly comparable to those clinical associations, and no prior coverage addressed taVNS in stroke. The large pooled effect should be interpreted as preclinical only.
Researchers analyzed data from several studies involving rodents to see how transcutaneous auricular vagus nerve stimulation (taVNS) affects memory. These animal models were designed to simulate the effects of a stroke. The study focused on how well the animals could navigate and remember their surroundings in specific tests.
The analysis of these rodent models showed a significant improvement in memory function following the treatment. However, it is important to note that these results come from a meta-analysis of preclinical studies. This means the data comes from animal testing rather than human clinical trials.
Because this research was conducted on rodents, the results do not prove that the treatment will work the same way in humans. There is currently no data on human safety or effectiveness for this specific treatment. These findings are early and do not change current medical practices for stroke recovery.
What this means for you:
Early animal studies show improved memory after stroke with nerve stimulation, but human results are not yet known.
Common questions
Is this treatment safe for humans?
The study did not provide data on human safety. Because the research was conducted on rodents rather than people, it is not yet known if this treatment is safe or effective for human patients. You should speak with a doctor regarding any stroke treatments.
What did the study find about memory?
The meta-analysis of rodent models showed a significant improvement in memory function. The researchers measured this by tracking how the animals performed in specific navigation tasks, such as the Morris water maze and the Barnes maze.
How many animals were included in the study?
The meta-analysis included data from 158 rodents. These animals were used to create experimental stroke models to test the effects of transcutaneous auricular vagus nerve stimulation on their memory.
BackgroundPost-stroke cognitive impairment (PSCI) substantially undermines rehabilitation adherence and poses a major obstacle to functional recovery. Transcutaneous auricular vagus nerve stimulation (taVNS), a noninvasive neuromodulation technique, has the potential to improve cognitive function, as demonstrated in various clinical and preclinical studies. Against this backdrop, we performed a meta-analysis of taVNS in experimental stroke models to quantify its cognitive benefits and probe the biological mechanisms involved in its effects.MethodsWe systematically searched databases, including PubMed, The Cochrane Library, Embase, and Scopus, to identify controlled animal studies evaluating taVNS in PSCI models. Following eligibility screening, five studies were selected for final synthesis. The primary cognitive outcomes comprised escape latency in the Morris water maze and the Barnes maze. Data extraction was performed independently by two investigators, and statistical analyses were performed using Review Manager 5.4 software.ResultsFive RCTs involving 158 rodents were analyzed in this study. The meta-analysis revealed that taVNS significantly improved memory function in PSCI animals (SMD = 1.85, 95% CI: 1.06 to 2.64, p
