Science AI Journal
Neuroscience · Research topic

Open research questions in Vagus Nerve Stimulation Research

114 unresolved questions extracted from the limitations and future-work sections of 213 Vagus Nerve Stimulation Research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • single-center study, - uncontrolled single-arm study, - small sample size of 50 patients, - lack of sham-control, randomization, or standard-care-only comparison group

    Multimodal biomarkers of response to transcutaneous auricular vagus nerve stimulation in disorders of consciousness: a study protocol · 2026 · DOI

  • further studies to determine the causal efficacy of taVNS, - investigation of multimodal brain functional biomarkers associated with observed response

    Multimodal biomarkers of response to transcutaneous auricular vagus nerve stimulation in disorders of consciousness: a study protocol · 2026 · DOI

  • Further clinical validation of focused ultrasound, trigeminal nerve stimulation, and temporal interference stimulation, - Investigation of treatment durability and maintenance protocols, - Studies on the effects of NIN on cognitive and behavioral outcomes

    Non-invasive neuromodulation for drug-resistant epilepsy: a contemporary structured review of mechanisms, clinical evidence and future directions · 2026 · DOI

  • The available literature is characterized by substantial clinical and methodological heterogeneity. Quantitative pooling across modalities would be methodologically inappropriate and could generate misleading estimates. There is a need for standardized maintenance protocols for drug-resistant epilepsy.

    Non-invasive neuromodulation for drug-resistant epilepsy: a contemporary structured review of mechanisms, clinical evidence and future directions · 2026 · DOI

  • the study had a limited sample size of 120 healthy adults, - the study only included participants who were 18-35 years old and fluent in English, - the study excluded participants with current treatment for mental health difficulties or history of severe mental disease

    Electroceutical enhancement of self-compassion training using transcutaneous vagus nerve stimulation: results from a preregistered fully factorial randomized controlled trial · 2025 · DOI

  • further research is needed to investigate the effects of tVNS on psychological disorders, - research should be conducted to examine the long-term effects of tVNS+SC-MIT, - studies should be done to explore the potential of tVNS in combination with other therapies

    Electroceutical enhancement of self-compassion training using transcutaneous vagus nerve stimulation: results from a preregistered fully factorial randomized controlled trial · 2025 · DOI

  • Transcutaneous auricular vagus nerve stimulation (taVNS) is a promising non-invasive approach for improving PD symptoms, and it has been hypothesized that its action is linked to the LC-NE brainstem system; however, its neurophysiological mechanisms remain poorly understood.

    Transcutaneous auricular vagus nerve stimulation demonstrates effects on pupil responses in Parkinson's disease · 2026 · DOI

  • Abstract Although extensive evidence links chronic pain (CP) to an increased cardiovascular risk, its direct impact on myocardial ischemia-reperfusion (MI/R) remains poorly understood.

    Elevated sympathetic tone exacerbates myocardial ischemia reperfusion injury through enhancing endothelial cell inflammation and apoptosis in chronic pain mice · 2026 · DOI

  • However, the causal relationship between SG, inflammation, and arrhythmias has not yet been fully clarified.

    Stellate ganglion, inflammation, and arrhythmias: a new perspective on neuroimmune regulation · 2024 · DOI

  • Neuromodulation by vagus nerve stimulation (VNS) provides therapeutic benefits in multiple medical conditions, including epilepsy and clinical depression, but underlying mechanisms of action are not well understood.

    Laterality, sexual dimorphism, and human vagal projectome heterogeneity shape neuromodulation to vagus nerve stimulation · 2024 · DOI

  • However, few studies have used randomized controlled trials to validate the effectiveness of taVNS.

    Effects of transcutaneous auricular vagus nerve stimulation and exploration of brain network mechanisms in children with high−functioning autism spectrum disorder: study protocol for a randomized controlled trial · 2024 · DOI

  • The sample size is limited, with only 20 adults participating in the study. The study only considers a single type of spinal cord injury. The follow-up period is only six months, which may not be sufficient to capture long-term effects.

    Transcutaneous Auricular Vagus Nerve Stimulation Combined with Continuous Antidromic Pelvic Neuromodulation and Rehabilitation for Recovery of Voluntary Locomotion in Spinal Cord Injury: An Exploratory Randomized Study · 2026 · DOI

  • The need for effective therapies to enhance neuroplasticity and improve motor function after spinal cord injury. The limited understanding of the effects of taVNS on recovery of voluntary locomotion in spinal cord injury.

    Transcutaneous Auricular Vagus Nerve Stimulation Combined with Continuous Antidromic Pelvic Neuromodulation and Rehabilitation for Recovery of Voluntary Locomotion in Spinal Cord Injury: An Exploratory Randomized Study · 2026 · DOI

  • The high dimensionality of T1w MRI scans makes it challenging to train predictive models directly on raw voxel intensities. The limited availability of annotated data makes it difficult to train deep learning models. The need to balance spatial precision and inter-regional interactions is a challenge in analyzing clinical imaging data.

    A deep representation learning model to predict response to vagus nerve stimulation · 2026 · DOI

  • Further research is needed to validate the VQ-VNS model in larger and more diverse populations. The model could be extended to other neurological disorders and treatments. Further research is needed to understand the underlying mechanisms of VNS response and how they relate to the model's predictions.

    A deep representation learning model to predict response to vagus nerve stimulation · 2026 · DOI

  • Further evaluation of tAN as a viable therapeutic option for patients with uncontrolled hypertension is needed. Studies evaluating the long-term efficacy and safety of tAN are required. Research on the mechanisms underlying the effects of tAN on blood pressure and other outcomes is needed.

    A sham-controlled randomised trial evaluating the safety, acceptability, and efficacy of autonomic neuromodulation using transcutaneous vagal sensory stimulation in uncontrolled hypertensive patients: rationale and study design of the SCRATCH-HTN study · 2026 · DOI

  • There is a need for innovative, non-invasive, and self-administered treatments for hypertension. Current treatment options have limitations, including non-adherence to prescribed medications due to drug intolerance or adverse side effects.

    A sham-controlled randomised trial evaluating the safety, acceptability, and efficacy of autonomic neuromodulation using transcutaneous vagal sensory stimulation in uncontrolled hypertensive patients: rationale and study design of the SCRATCH-HTN study · 2026 · DOI

  • The study only included healthy adults. The sample size was limited to 30 participants per study. The study did not evaluate the long-term effects of taVNS.

    Participant-centered tolerability of transcutaneous auricular vagus nerve stimulation: insights from two crossover studies · 2026 · DOI

  • To evaluate the long-term effects of taVNS. To compare the effects of taVNS on clinical populations, such as patients with chronic pain or depression. To optimize the stimulation parameters for taVNS to improve participant comfort and tolerability.

    Participant-centered tolerability of transcutaneous auricular vagus nerve stimulation: insights from two crossover studies · 2026 · DOI

  • The paper notes that adverse events were minimal across modalities, but does not discuss other limitations. The review is limited to non-invasive neuroregulation techniques and does not consider invasive techniques. The paper does not discuss the long-term effects of these techniques.

    Non-invasive neuroregulation techniques applied to patients with consciousness disorders: a narrative review · 2026 · DOI

  • Conflict of interest remain The current evidence base has several important limitations. Most studies involve small sample sizes (typically 10–40 patients) and employ heterogeneous protocols, hindering definitive conclu- sions and optimal parameter identification. Study designs vary in rigor, with many lacking adequate blinding or sham controls. Outcome measures are inconsistent across studies, and long-term functional outcomes insufficiently characterized. Geographic concentration of certain studies (particularly for acu- puncture) raises concerns about publication bias. Mechanistic understanding of consciousness recovery and reliable predictors of treatment response remain incomplete. This narrative review provides qualitative synthesis rather than quantitative meta-anal- ysis and may not have captured all relevant studies, particularly non-English publications. As this is a narrative review without a formal PRISMA workflow or risk-of-bias assessment, caution should be exercised when interpreting statements about the over- all strength of evidence across modalities. The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

    Non-invasive neuroregulation techniques applied to patients with consciousness disorders: a narrative review · 2026 · DOI

  • examining sex-specific taVNS effects, - investigating taVNS effects on participants with specific conditions, - studying the long-term effects of taVNS, - exploring the use of taVNS in combination with other therapies

    Transcutaneous auricular vagus nerve stimulation during movement selectively activates motor circuitry without additional cortical or autonomic effects · 2026 · DOI

  • Investigation of reliable predictors of efficacy for VNS. Evaluation of the long-term effectiveness of VNS in pediatric drug-resistant epilepsy.

    Clinical effectiveness of vagus nerve stimulation in pediatric drug-resistant epilepsy: etiology-based comparison of genetic and non-genetic cohorts for seizure reduction and antiseizure medication burden · 2026 · DOI

  • The impact of genetic etiology on treatment efficacy and antiseizure medication burden remains unclear. Limited understanding of the effectiveness of VNS in pediatric drug-resistant epilepsy.

    Clinical effectiveness of vagus nerve stimulation in pediatric drug-resistant epilepsy: etiology-based comparison of genetic and non-genetic cohorts for seizure reduction and antiseizure medication burden · 2026 · DOI

  • Despite this, VNS can drive CAIP-independent pathways to reduce inflammation in the spleen and intestinal tract, although the circuitry modulating colonic inflammation remains underexplored.

    Vagus nerve stimulation limits colonic inflammation through distinct neuroimmune circuitry shaped by inflammatory history · 2026 · DOI

Most-cited papers in Vagus Nerve Stimulation Research

Most recent work

Find a gap in your own Vagus Nerve Stimulation Research sub-topic

This page shows what the Vagus Nerve Stimulation Research literature already flags as unresolved. To narrow it to your specific question, run the guided finder — it searches the gap library on demand and checks candidates against 250M+ OpenAlex works.

Open the Research Gap Finder →

Related topics in Neuroscience

Autism Spectrum Disorder Research
1,667 open questions
Memory Processes and Influences
744 open questions
Neural and Behavioral Psychology Studies
697 open questions
Psychology of Moral and Emotional Judgment
544 open questions
Neurobiology of Language and Bilingualism
491 open questions
Hearing Loss and Rehabilitation
465 open questions
Functional Brain Connectivity Studies
439 open questions
Visual perception and processing mechanisms
367 open questions
114 open questions have been extracted from the limitations and future-work passages of 213 Vagus Nerve Stimulation Research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

Tools for your next paper

Gaps & Literature SearchFind open questions in any field — 120,000+ open gaps mined from our own library.Pre-CheckIs your paper ready? A Tier 1–5 acceptance probability in seconds.Journal FinderA ranked shortlist of target journals from a 17,500-venue index.Duplicate Publication CheckerCheck prior-publication & salami-slicing risk across 8 sources.Citation GeneratorFreeA DOI or title → APA, MLA, Vancouver, Chicago, BibTeX, RIS. No signup.Graphical Abstract MakerFreeTurn your findings into a colorblind-safe graphical abstract.

Compare the category — Honest roundups of the AI research tools, ours listed alongside the alternatives.

Command palette

Jump anywhere, run any action.