Decentering
The protective stance the wiki’s mindfulness pages kept naming without defining. Decentering is the shift from being inside a thought — treating “I am worthless” as a fact and a call to elaborate — to observing it — noting “a thought that I am worthless is present” and letting it pass. It is the trainable counter-pole to cognitive-reactivity, and the proposed active ingredient of MBCT (Segal, Williams & Teasdale).
Why it earns a page now
It had appeared as a phrase — “Decentering/reperceiving” on mindfulness-interoceptive-training, “decentering” in the relapse literature cited on interoceptive-training-clinical — but Farb et al. (2011) gives it something the phrase lacked: a prognostic neural correlate. In remitted depressed patients, trait acceptance (AAQ-R) tracked sensory (visual cortex) reactivity to sad films, and that sensory reactivity predicted sustained remission (r = −.73 with relapse). The decentered/accepting mode is the one that just watches the emotional stimulus rather than elaborating it into self-referential rumination — the disengagement from self-referential mPFC that Farb found protective.
The predictive-coding reading
Decentering maps closely onto perceptual-inference: changing one’s relationship to a sensation rather than the sensation itself — lowering the precision assigned to one’s own priors, permitting the experience to be what it is without the reflexive regulatory move. Farb et al. (2015) characterize contemplative acceptance/equanimity in exactly these terms, and contrast it with active-inference (suppression, distraction, reappraisal — altering the signal). Decentering is the psychological name for the stance; perceptual inference is its proposed computational form.
This inheritance carries the same open problem, recorded on perceptual-inference-as-regulation: is “choosing to decenter” a genuinely distinct, non-regulatory mode, or is the very act of stepping back itself a meta-level regulatory (active-inference) move? Decentering does not escape that question — it is one of its cleanest instances.
A complication for “decentering is the active ingredient”
The claim that decentering is MBCT’s specific active ingredient takes a hit from Farb et al. (2022). In that RCT, MBCT and Well-Being CT — the latter a reappraisal/well-being therapy that does not train decentering — reduced the same prefrontal reactivity biomarker equally, with equal relapse rates and no mechanistic difference. If decentering were the privileged route to lowering cognitive reactivity, a therapy built around it should have outperformed one that is not; it did not. This does not show decentering is inert — both therapies may reach the same endpoint by different means — but it does mean the wiki cannot treat “decentering lowers relapse-predicting reactivity” as an MBCT-specific mechanism. See two-factor-model-of-relapse-vulnerability, does-mindfulness-enhance-interoceptive-accuracy.
The honest boundary
Decentering is defined over thoughts and feelings in general; the wiki’s interest is where it touches the body. The interoceptive claim — that decentering from bodily sensations (rather than the visual stimulus Farb measured, or the verbal thoughts MBCT targets) is protective — is a generalization, not something Farb et al. (2011) directly show, since their protective sensory pole is exteroceptive. What the paper establishes is the shape: elaboration is pathogenic, observation is protective. Whether the same holds when the object of observation is an interoceptive sensation is the bet the wiki’s applied pages (mindfulness-interoceptive-training, interoceptive-training-clinical) are making — a reasonable bet, flagged as a bet.