Bioelectronic medicine
The wiki’s first translational thread that treats the interoceptive pathway as the target rather than interoceptive attention. Everything else in the applications folder — interoceptive-training-clinical, mindfulness-interoceptive-training, somatic-experiencing, and the interoceptive-exposure method — works by changing how a person attends to, appraises, or tolerates bodily sensation. This works by putting current into the nerve.
Introduced with the Bonaz et al. (2021) ingest. Bruno Bonaz is a vagus-nerve-stimulation researcher and the review’s translational close is largely his programme; read accordingly. See bruno-bonaz.
The definition and the scope
Per the review’s glossary, bioelectronic medicine “builds upon mechanistic insights into neural control of biological processes that underlie disease. It is based on the development of devices to modulate these specific neural circuits as a therapy using electromagnetic fields.” The techniques named:
| technique | invasiveness | applications cited |
|---|---|---|
| Vagus nerve stimulation (VNS) | implanted | epilepsy, depression, inflammation, obesity |
| Spinal cord stimulation | implanted | chronic pain |
| Deep brain stimulation | implanted | — |
| Transcranial magnetic stimulation | non-invasive | — |
| Transcranial direct current stimulation | non-invasive | — |
Reported benefits are antinociceptive, antidepressive and anti-inflammatory. In animal work, optogenetics and pharmacogenetics are named as further stimulation approaches offering cell-type-specific manipulation.
Why the vagus is the centre of it
The vagus is the pathway that makes the framing coherent, and it does three jobs in this review:
- Immune-to-brain afferent signalling. Activation of the immune system is signalled to the brain particularly via the vagus; this is the interoceptive channel of sickness-behaviors and the entry point for inflammation into mood.
- The cholinergic anti-inflammatory pathway. Bonaz’s own line (Bonaz et al. 2013, 2016): efferent vagal activity suppresses peripheral inflammation, so stimulating the nerve is an anti-inflammatory intervention rather than merely a neural one. This is what makes VNS a candidate for inflammatory disease and, by the inflammation-to-depression bridge, for psychiatric disease.
- The microbiota-gut-brain-axis interface. Vagal afferents carry microbial signals, directly (TLR4) and via enteroendocrine relay.
The review adds that growing understanding of interoceptive immune pathways, VNS included, has “already opened up therapeutic applications” for psychiatric disorders — naming anticytokine therapy, NSAIDs, and minocycline suppression of microglial activation for depression. Those are pharmacological rather than bioelectronic, but they share the logic: treat the interoceptive signal, not the interpretation of it.
The obesity case, and its evidential shape
Worth recording because it shows the reasoning at its weakest. The argument: vagal afferent biophysical properties are impaired in obesity; leptin resistance of vagal afferents accompanies hyperphagia; disturbed vagal signalling favours overconsumption and weight gain; therefore VNS may help manage obesity. The evidence offered: “circumstantial evidence from patients losing weight following VNS applied for the treatment of epilepsy or depression, yet findings from clinical trials for obesity are awaited.” Chronic VNS reduced weight gain, food consumption and sweet craving in adult obese minipigs.
A mechanistic story, an incidental clinical observation, and a pig. The review states this plainly enough that the wiki can record it without editorializing further.
Non-invasive VNS, and a stimulation protocol with a genuinely new idea in it
Added with the Weng et al. (2021) ingest, which supplies the technical detail Bonaz’s section did not, and one mechanism worth more than the rest of this page.
taVNS. The NTS — the vagus’s main brainstem target — also receives somatosensory afference via the auricular branch of the vagus nerve (ABVN), which is purely afferent and innervates the outer ear, most consistently at the cymba conchae. So the pathway is reachable through skin. Transcutaneous auricular VNS modulates brainstem and cortical areas (left PFC, bilateral postcentral gyrus, left posterior cingulate, left insula) similar to those modulated by implanted VNS, and commercial devices have been approved. Typical VNS parameters given: 20–30 Hz, 0.25–3.5 mA, 30–60 s ON / 5 min OFF. This matters for the invasiveness column in the table above: the technique that carries most of the field’s rationale no longer requires surgery.
RAVANS, and why it is the interesting part. The dorsal medullary vagal system runs in phase with breathing. NTS second-order relay neurons receive pulmonary-stretch and aortic-baroreceptor afference primarily during inhalation, and are proposed to receive inhibitory input during inhalation and facilitatory input during exhalation from the ventral respiratory column. Respiratory-gated auricular vagal afferent nerve stimulation therefore fires into the exhalation window — less competing afference, a more receptive relay. Reported: enhanced brainstem targeting and improved therapeutic response in chronic pelvic pain and migraine.
Note what that is: an intervention whose active principle is timing, not dose or site. The same current, delivered at a different phase of an unrelated rhythm, is claimed to work better because the receiving nucleus is in a more receptive state. The wiki has met this shape once before, in biology rather than engineering — the urethral-sphincter bursting that defeats afferent accommodation during voiding, on urinary-interoception. Neither literature cites the other and neither invokes precision-weighting; recorded as a structural rhyme, not as evidence for active-inference. See respiratory-interoception for the entrainment claim it rests on.
Weng et al. propose extending respiratory gating to spinal cord stimulation, implanted VNS and trigeminal nerve stimulation, and — more ambitiously — combining RAVANS with breath-focused meditation, on the grounds that the meditation directs attention to the very rhythm the stimulation is gated to. No such study exists. It is the wiki’s first proposal to run a neuromodulatory and a contemplative intervention as one treatment, and it is the clearest illustration of what the four-domain framework is for.
The comparison the wiki should hold
Set against the attention-based applications, bioelectronic medicine makes a different bet about where interoceptive disorders live. The contemplative and exposure traditions locate the problem in the relationship to bodily signal — avoidance, catastrophic appraisal, hypervigilance, or in Farb et al.’s terms a failure of interoceptive regulation. Bioelectronic medicine locates it in the signal and its conduction.
Bonaz et al.’s own framing licenses both, and that is the point of their Figure 1: dysfunction can strike at any level of the neuraxis, so an intervention at any level might be the right one. What the review does not offer — and what nothing in the wiki offers — is any way to tell which level a given patient’s problem is on. That is the same stratification gap interoceptive-training-clinical runs into from the psychological side and interoceptive-exposure runs into with Van der Does et al.’s ambulatory-monitoring proposal.
A second source now licenses both sides more explicitly still. Weng et al. put nerve stimulation, slow-breathing and mindfulness on one diagram as three entry points into a single pathway, and recommend combining them. That makes the stratification gap sharper rather than smaller: if all three work on one pathway, the question of which entry point for which patient becomes unavoidable, and neither review asks it.
Status
Recorded as a real and growing clinical field with a genuine mechanistic rationale, held here entirely through one review section by an interested party, with no trial evidence read first-hand. Bonaz cites Pavlov & Tracey’s Bioelectronic Medicine volume (Cold Spring Harbor, 2019) as the field’s reference work; nothing of it is in raw/. Flagged for first-hand reading if a primary source arrives.