Dissolving stigma.
Improving access—for free.
Clear referral pathways.

The 63 publications include at least 15 primary reports with random allocation, alongside feasibility studies, reviews and design papers. Some randomised trials tested digital or community support without a live feedback signal. In the 188-person inpatient trial, an independent psychiatrist assessed anxiety while masked to allocation. Participants and therapists knew the intervention. Masking is unverified in several other reports. A corpus-wide double-blind count remains undetermined. Inpatient trial methods

A meta-analysis of 24 HRV studies found lower stress and anxiety versus controls. A review of 18 remote HRV studies found benefits for depression and HRV, with an inconclusive pooled result for stress. The consumer EEG review found no sham-feedback control in its randomised training trials. Expectation and attention may therefore explain part of the observed benefit. These reviews supplement the 63-publication register. HRV meta-analysis · Remote HRV meta-analysis · EEG meta-analysis

Five distinct journal reports were identified. Three documented live EEG feedback: the AR mindfulness trial, a four-firefighter pilot and a 100-person study of hospital staff. The staff study allocated participants alternately to VR with EEG feedback or audio meditation, so immersion and feedback varied together. The nature-VR study recorded EEG before and after meditation. The 33-person blood-donor pilot assessed mood before and after VR. An Apple Watch heart-rate intervention remains unverified in these five reports.

AR mindfulness · Nature VR and EEG · Firefighter pilot · Hospital staff · Blood donors

Two are in the original 63. The other three are linked here as supplemental reading.

One game study recruited 47 participants aged 18–24. Student trials include young adults with mixed or incompletely reported ages. An Australian Defence Force study tested delivery with 189 trainees. A 342-soldier randomised trial found no overall preventive effect on post-deployment PTSD. An Australian pilot with 20 Aboriginal young people aged 7–16 measured HRV during a culturally informed VR practice. In Kampala, 335 refugee youth aged 16–25 participated in a VR trial. Self-compassion improved, while depression outcomes were comparable to control. Neither youth study established an effect of live wearable feedback.

Ages 18–24 · Australian Defence Force · National Guard · Aboriginal youth in NSW · Refugee youth in Kampala

Studies in Tanzania, Lebanon and Türkiye inform delivery through local facilitators or accessible digital formats. These settings still need direct evaluation of the proposed road-train experience, including access in communities facing extreme poverty. Tanzania · Lebanon · Türkiye

1. Brief Interactive Virtual Reality Mindfulness Training with Real-Time Biofeedback for Anxiety Reduction: A Pilot Study

   Live HRV drove changes in fog, sound and visuals.

2. Enhancing Mindfulness Training in Virtual Reality: A Randomized Trial of Biofeedback Integration

   The candle flame changed with measured heart rate. The baseline recording calibrated the mapping.

3. Using a Biofeedback-Based Mindfulness Practice System to Enhance Mindfulness and Alleviate Anxiety in College Students: A Randomized Controlled Trial

   The MindJourney system returned respiratory feedback. Skin conductance was a measurement outcome.

4. The efficacy of virtual reality-enhanced EEG biofeedback in anxiety treatment: analysis of a digital health intervention

   EEG training supplied neurofeedback in the intervention. Clinical anxiety ratings were outcomes.

5. ZenG

   Relative alpha-band EEG changed the tree colour. Twelve adults took part in informal prototype testing.

6. Neurological Evidence of Diverse Self-Help Breathing Training With Virtual Reality and Biofeedback Assistance: Extensive Exploration Study of Electroencephalography Markers

   A respiration belt controlled the meadow. The investigators recorded EEG to compare the practice conditions.

7. Effects on Mood and EEG States After Meditation in Augmented Reality With and Without Adjunctive Neurofeedback

   Frontal gamma asymmetry moved a glowing ball and determined when the AR story progressed.

8. Mindfulness Development via Biofeedback for Anxiety in Hospitalized Patients: A Randomized Controlled Trial

   Auditory feedback followed EEG alpha power. A separate training stage varied audiovisual feedback with current heart rate. A psychiatrist masked to allocation rated anxiety.

9. The Applications of the Mindfulness-Based Cognitive Therapy and HRV Biofeedback in Modern Psychotherapy

   The case describes a participant viewing heart-rhythm changes and HRV during sessions.

10. Biofeedback-Enhanced Virtual Reality Training for Stress Regulation: Concept and Pilot Study Results

    The field of view changed with a stress level derived from HRV in a seven-person pilot.

11. A mobile VR-based respiratory biofeedback game to foster diaphragmatic breathing

    A controller on the abdomen sensed movement caused by breathing and fed it into the game.

12. Use of Biofeedback-Based Virtual Reality in Pediatric Perioperative and Postoperative Settings: Observational Study

    Inner Balance and emWave presented a coherence score calculated from beat-to-beat intervals.

13. Mindfulness-based Stress Reduction in VR: Visualising Meditation Performance using Real-time EEG Neurofeedback

    The authors describe a preliminary evaluation in which an EEG-derived relaxation estimate drove visual feedback. The accessible abstract gives limited detail about the calculation.

14. Ego-depletion and motor skill performance under pressure—experimental effects of a short term virtual-reality based mindfulness breathing meditation with integrated biofeedback

    Abdominal movement during exhalation changed the virtual environment. The testing staff were masked to condition.

15. HeartBit: mindful control of heart rate using haptic biofeedback

    The handheld device reproduced a measured heartbeat through touch.

16. Attention Regulation Framework

    The evaluated interfaces tracked deliberate physical movements to support attention.

17. Using a virtual reality game to train biofeedback-based regulation under stress conditions

    The training displayed the pulse trace. A study-defined stress score used rolling heart rate relative to baseline. HRV was an outcome.

18. Development of a modular stress management platform (Performance Edge VR) and a pilot efficacy trial of a bio-feedback enhanced training module for controlled breathing

    A respiratory belt provided controlled-breathing feedback.

19. Virtual reality versus 2D biofeedback for children and adolescents with stress related disorders: a randomized controlled trial

    A baseline heart-rate threshold guided feedback in both the 2D and VR training.

20. Designing and Utilizing Biofeedback Games for Emotion Regulation

    In Nevermind, the game estimated arousal from beat-to-beat variability. The report also illustrates heart-rate recordings separately.

21. Evaluation of a Virtual Reality Platform to Train Stress Management Skills for a Defense Workforce: Multisite, Mixed Methods Feasibility Study

    A live respiratory trace provided feedback on controlled breathing in ADF training.

22. Heart Rate Variability and Cognitive Bias Feedback Interventions to Prevent Post-deployment PTSD: Results from a Randomized Controlled Trial

    The on-site emWave games responded to HRV. The home prompt provided separate paced-breathing practice.

23. A Pilot Study of a Three-Session Heart Rate Variability Biofeedback Intervention for Veterans with Posttraumatic Stress Disorder

    The veteran waitlist pilot used clinical HRV biofeedback and a smartphone with a sensor for home practice.

24. Using biofeedback while immersed in a stressful videogame increases the effectiveness of stress management skills in soldiers

    The soldiers’ game combined heart rate and skin conductance. The coach adjusted each signal’s weight in the stress feedback.

25. Virtual reality experiences for breathing and relaxation training: The effects of real vs. placebo biofeedback

    The environment responded to the participant’s breathing, heart rate and skin conductance, or to another participant’s replay.

26. Receiving self-compassion in the virtual world: Testing the potential value of biofeedback

    A visual pulse showed the participant’s own heart rate during self-compassion practice.

27. Augmented Virtual Reality Meditation

    Pairs saw their respiratory synchrony and a comparison of EEG frontal asymmetry. HRV and skin conductance were also recorded for analysis.

28. Feeling-the-Beat: Enhancing Empathy and Engagement During Public Speaking Through Heart Rate Sharing

    The system shared heart rate between speakers and audience members. The comparison used fabricated or absent signals.

1. Designing Mindfulness Practice System Based on Biofeedback in VR Environment

   The system used continuous breathing cues and intermittent head-orientation feedback. Related to the MindJourney college paper.

2. Mindful Garden: Supporting Reflection on Biosignals in a Co-Located Augmented Reality Mindfulness Experience

   The headband-based demonstration converted EEG into a flower display for a pair. This entry refers to the smart-glasses version.

3. Resident Thrum: Designing for Group Cardiac Synchronization through Multimodal Biofeedback

   The installation returned heartbeats as sound, vibration and light, and changed the environment with group cardiac synchrony.

1. Exploring technology-assisted mindfulness: a systematic progressive review on the role of virtual reality

   Review of VR mindfulness research.

2. Challenges and Opportunities of Immersive Technologies for Mindfulness Meditation: A Systematic Review

   Systematic review of immersive mindfulness.

3. Human-Computer Co-Regulation: A Review of Biofeedback for Meditative Practice

   Review of real-time physiological feedback systems.

4. Technology Configurations and Adherence in Virtual Reality-Based Mindfulness: A Systematic Review of Headsets, Wearables, Software, and Therapeutic Applications

   Review of headset and wearable configurations.

5. Realidade virtual na prática de mindfulness em psicoterapia: uma revisão narrativa

   Narrative review of VR practice in psychotherapy.

6. Virtual Reality Biofeedback in Health: A Scoping Review

   Scoping review of VR biofeedback in health.

7. An Integrative Model for the Effectiveness of Biofeedback Interventions for Anxiety Regulation: Viewpoint

   Conceptual model of biofeedback mechanisms.

8. Digitally Assisted Mindfulness in Training Self-Regulation Skills for Sustainable Mental Health: A Systematic Review

   Systematic review of digital mindfulness.

9. Immersive VR as a Promising Technology for Computer-Supported Mindfulness

   Review chapter about computer-supported mindfulness.

10. Virtual Reality-Based Biofeedback System: A Review

    Engineering review chapter. Bibliographic record only.

11. A Review of Interactive Technologies as Support Tools for the Cultivation of Mindfulness

    Review of interactive mindfulness technology.

12. Biofeedback-Based Connected Mental Health Interventions for Anxiety: Systematic Literature Review

    Systematic review of connected biofeedback interventions.

13. Interventions Based on Biofeedback Systems to Improve Workers' Psychological Well-Being, Mental Health, and Safety: Systematic Literature Review

    Review of workplace biofeedback.

14. A Narrative Review of Mindfulness-Based Interventions Using Virtual Reality

    Narrative review of mindfulness in VR.

15. Biofeedback-based Digital Games and Well-being in Childhood: A Systematic Review

    Systematic review of youth biofeedback games.

16. Heart Rate Variability Biofeedback as a Treatment for Military PTSD: A Meta-Analysis

    Meta-analysis of HRV biofeedback for military PTSD.

17. Virtual Reality Breathing Interventions for Mental Health: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

    Systematic review of VR versus other methods of delivering breathing exercises.

18. Virtual reality improves emotional but not cognitive empathy: A meta-analysis

    Meta-analysis of VR and empathy.

1. Virtual Reality for Anxiety Reduction Demonstrated by Quantitative EEG: A Pilot Study

   The researchers compared EEG recordings around the VR meditation and quiet-rest conditions.

2. Brief Virtual Reality and Mixed Reality Mindfulness Breathing Exercise for Emotional Well-Being and Cognitive Functions in University Students: Within-Subjects Experimental Design Study

   VR and MR guided the breathing exercises. A live physiological input controlling the exercise was unverified.

3. Virtual reality mindfulness training for veterans in residential substance use treatment: Pilot study of feasibility and acceptability

   A feasibility study of VR mindfulness in residential substance use treatment. A live physiological feedback loop was unverified.

4. Emotional intelligence training improves stress regulation and performance in high-stress occupations

   The emotional intelligence training trial measured cortisol and task performance.

5. Does Virtual Reality Training Increase Mindfulness in Aboriginal Out-of-Home Care Children?

   The NSW Aboriginal youth study measured HRV before and during the VR body scan.

6. Findings from the Tushirikiane-4-MH (supporting each other for mental health) mobile health–supported virtual reality randomized controlled trial among urban refugee youth in Kampala, Uganda

   The Kampala trial tested VR and group support for refugee youth.

7. Improving mental health in low-resource settings: A feasibility randomized controlled trial of a transdiagnostic psychological intervention among Burundian refugee adolescents and their caregivers

   The Tanzania feasibility trial tested a facilitator-led psychological intervention.

8. Evaluation of an integrated intervention to reduce psychological distress and intimate partner violence in refugees: Results from the Nguvu cluster randomized feasibility trial

   The Nguvu trial tested a community intervention for refugee women in Tanzania.

9. Effects of a WHO-guided digital health intervention for depression in Syrian refugees in Lebanon: A randomized controlled trial

   The Lebanon trial tested guided digital self-help.

10. Effectiveness of a WHO self-help psychological intervention for preventing mental disorders among Syrian refugees in Turkey: a randomized controlled trial

    The Türkiye trial tested facilitator-led audio and illustrated self-help.

1. Integrating Cognitive Behavioral Therapy and Heart Rate Variability Biofeedback in Virtual Reality, Augmented Reality, and Mixed Reality as a Mental Health Intervention

   The workshop abstract describes simulated HRV feedback and a planned comparison. Live sensing in participants is unverified.

2. Ephemeral Breath: Non-contact Biofeedback System in Habitual Behaviors for Everyday Mindfulness

   The accessible conference record identifies non-contact biofeedback. The sensing method and participant evaluation need confirmation.

3. Flowing Landscapes: A Motion-Synced In-Car VR Mindfulness Experience with Biofeedback-Driven Adjustments for Motion Sickness

   The abstract confirms physiology-driven adjustments during testing with 20 people. It leaves the specific signal unidentified.

4. Vagal Nerve Biofeedback Intervention for Improving Health Outcomes Among Ukrainian Forced Migrants: A Proof-of-Concept Study

   The authors describe live HRV feedback as a technique. Their procedure specifies resting HRV measurements before and after practice. They leave the participant’s access to a live display during the exercise unclear.