Zindel V. Segal
Clinical psychologist and co-developer of Mindfulness-Based Cognitive Therapy (MBCT), and Farb’s senior collaborator on the wiki’s first Farb empirical paper. Segal enters the wiki as the theorist of why a recovered depressive relapses — and the person who turned that theory into both a prediction and a treatment.
The theory: cognitive reactivity / differential activation
Segal’s central claim (developed from Teasdale’s differential-activation hypothesis) is that vulnerability to depressive relapse lives not in a person’s baseline mood but in what mild dysphoria reactivates. In the recovered-but-vulnerable patient, a small dip in mood re-opens a whole pattern of negative, ruminative, self-referential thinking — the pattern present during the original episode — and it is this reactivated processing, not the dip itself, that drives the slide back into depression. See cognitive-reactivity.
Segal et al. (2006) made this measurable: sad-mood provocation in remitted patients, and the degree of reactivated dysfunctional attitude predicted relapse up to 18 months later. Farb et al. (2011) is the neuroimaging sequel — the same paradigm (sad film provocation, 18-month follow-up) locating the reactivity in self-referential cortex, and finding that felt sadness itself does not predict relapse while its mode of cortical processing does.
The treatment: MBCT and decentering
MBCT adapts Kabat-Zinn’s MBSR specifically for relapse prevention. Its proposed active ingredient is decentering — learning to see thoughts and feelings as passing mental events rather than as truths or cues to elaborate — which is precisely the disengagement from self-referential rumination that Farb et al. find protective. MBCT is the clinical bridge from this wiki’s contemplative-interoception material (mindfulness-interoceptive-training, mindfulness-meditation) to the depression-relapse literature: the mindfulness the wiki treats mostly as a wellbeing intervention was, in Segal’s hands, first a prophylactic against a specific, measurable neural vulnerability.
A caution his own later work supplies: in Farb et al. (2022), MBCT and Well-Being CT produced identical neural prophylaxis (reduced left-DLPFC reactivity) and identical relapse rates. Whatever is doing the protective work, it is not unique to mindful decentering — the same effect appears in a well-being reappraisal therapy that does not train body awareness at all. See two-factor-model-of-relapse-vulnerability.
Why he belongs in an interoception wiki
Obliquely, but load-bearingly. Segal is the clinical anchor of the sensory-vs-elaborative distinction the wiki’s interoception theory rests on: his cognitive-reactivity paradigm is where Farb first showed (in 2011) that elaborative self-referential reactivity is pathogenic and sensory reactivity protective — the finding Farb then generalized from exteroceptive vision to interoception. MBCT is also the intervention most often named on this wiki’s applied pages (interoceptive-training-clinical, is-more-interoceptive-awareness-better) as the body-awareness treatment for depression, and Segal is its source.