Bridging Equity and Rigor in Digital Mindfulness
SOMA — the Standardized Open-source Mindfulness Architecture — is the first modular, open-source stimulus library purpose-built to provide mechanistically orthogonal active controls and equity-engineered materials for mindfulness RCT research.
Mechanistic Rigor
Every mindfulness asset is paired with a structurally equivalent Active Control — isolating bottom-up experiential sensing from top-down analytical engagement.
Health Equity
All scripts validated at Grade 5–6 reading level with resource-neutral instructions. No quiet space, no special equipment, no prior experience required.
Radical Modularity
Themes are formally decoupled from practices via a Universal Bridge, enabling dismantling studies, longitudinal rotation, and flexible experimental design.
Three layers, 88 distinct assets
SOMA is a modular system — not a fixed protocol. Building blocks combine to produce an experimental toolkit far larger than any single-session design.
Thematic Intros (~2 min)
6 attitudinal themes per condition — each in two A/B variations — frame how participants engage with the practice. Mindfulness themes: Being, Curiosity, Patience, Acceptance, Letting Go, Gentleness. Active Control themes: Stability, Organization, Synchronization, Analysis, Orientation, Calibration.
Sensory Practices (~10 min)
16 practice modules spanning formal seated meditation and informal everyday activities — the primary "active ingredient" carrying the mechanism of each session.
Universal Bridge (10–20 s)
A standardized, resource-neutral transition linking any intro to any practice. Identical across conditions — the "glue" enabling radical modularity.
Total English Baseline Assets
(12 M + 12 C, A/B)
Practices
Practices
(Mindfulness)
(Active Control)
Mindfulness vs. Active Control
Every asset is doubled for scientific rigor. The control is not passive — it is an analytically structured counterpart matched on all non-specific factors. Critically, SOMA's Active Control modules are not limited to mindfulness research: their analytical engagement framework can serve as principled comparators for any intervention whose mechanism involves experiential, bottom-up, or interoceptive processing — including ACT-based protocols, compassion training, and somatic therapies.
Mindfulness Condition
Directs attention to bottom-up experiential sensing. Participants notice, observe, and experience without categorising or analysing.
Active Control Condition
Directs attention to top-down analytical categorization. Same duration, structure, vocal prosody — differing only on the proposed mechanism. Usable as a comparator for any experiential intervention.
Modular by Design — Not a Fixed Curriculum
While SOMA provides a Validation Matrix (A–P) used as the deployment sequence in the pre-registered RCT, this ordering is a recommendation, not a constraint. SOMA's radical modularity means any thematic introduction can be paired with any practice via the Universal Bridge. Researchers can use the matrix as a ready-made multi-session curriculum, assemble custom formal/informal ratios (e.g., 70/30 or 30/70), or run single-session mechanistic studies using any theme–practice pairing. The library is a toolkit, not a protocol.
Pre-registered RCT (N = 360) — empirical proof-of-concept
A pre-registered randomised controlled trial deployed all 16 SOMA pairings simultaneously. Two of three pre-specified hypotheses were supported; the third — credibility equivalence — revealed a residual gap we document transparently rather than obscure.
Three steps from research question to deployment
SOMA employs a Modular Matrix that formally decouples three orthogonal dimensions: thematic framing (Introduction module), sensory or analytical delivery mode (Practice module), and experimental condition (Mindfulness vs. Active Control). A standardised Universal Bridge — a 10–20 second resource-neutral transition — connects each thematic introduction to each practice module, enabling future dismantling studies to isolate contributions of attitudinal versus attentional components independently.
The library is designed for flexible deployment. Pairings can be used as single-session interventions or combined across multiple sessions to construct longitudinal curricula of any duration, varying the ratio of formal to informal practices to suit the population, setting, and research question. The three steps below involve researcher judgment rather than a fixed algorithm.
The three decisions
Each step is a deliberate research design choice. None is mechanical — but each is bounded and documented, so methods sections can describe exactly what was deployed.
Pick a target attitudinal orientation
Select the Theme that best matches the construct your study is targeting. As a general indication:
Choose Formal or Informal practice
The practice module carries the active ingredient. Match the delivery mode to your design constraints:
Confirm the comparator
By default, every pairing comes with an Attentional Object Shift-matched Active Control. You can choose how conservative to be:
Five ways to use SOMA
The same 88 assets serve very different research designs. Pick the pathway that matches your question — single-session, longitudinal, dismantling, comparator for adjacent therapies, or as a labelled corpus.
Single-session intervention
Deploy one full Mindfulness–Active Control pairing (~12 min per arm) as a brief intervention. Ideal for mechanistic RCTs, classroom studies, or stress-induction follow-ups where time and budget are constrained.
SOMA-M-T03A-P07 / SOMA-C-T03A-P07.
Multi-session longitudinal curriculum
Sequence multiple pairings across sessions to construct a curriculum of any duration — 2, 4, 8 weeks, or longer. Vary the formal-to-informal ratio to suit the population and setting.
Dismantling study
The Universal Bridge formally decouples theme from practice. Mix-and-match introductions and practices to isolate the contribution of attitudinal framing versus attentional task — something the existing literature cannot do cleanly.
Comparator for adjacent therapies
SOMA's Active Control modules can serve as principled comparators for any intervention whose proposed mechanism involves experiential, bottom-up, or interoceptive processing — even outside mindfulness proper.
Labelled corpus for AI / NLP work
The 88 expert-validated assets constitute a publicly available, mechanistically labelled corpus — every script tagged as experiential or analytical — usable for AI-guided psychoeducational tools, content classifiers, or training data for mindfulness chatbots.
Translation and cross-cultural deployment
The English baseline is finalized. Translation protocols and back-translation guidelines for non-Anglophone deployments will be released on OSF, with controlled-vocabulary glossaries to preserve the Attentional Object Shift principle across languages.
A note on study design
SOMA has been validated on mechanistic outcomes — specifically the SMS × AES double dissociation and the Semantic Differential composite. Whether the mindfulness arm produces effects on downstream outcomes of interest (stress, anxiety, mood, sleep, and others) is an open empirical question that future studies using SOMA are designed to address. When planning a SOMA-based study, select your primary outcomes based on your theoretical question and conduct power analyses using effect sizes from the broader mindfulness literature rather than the SOMA validation data alone.
Always cite the specific pairing codes
All deployments — single-session, longitudinal, or dismantling — should cite specific pairing codes in their method sections and pre-registrations, e.g., SOMA-M-T03A-P07 for the Mindfulness arm and SOMA-C-T03A-P07 for its matched Active Control. This is what makes pairing-level meta-analytic synthesis possible across studies that deploy SOMA, and it lets future replications target the exact same materials.
Mindfulness Attitudinal Framings
Each intro establishes a specific attitudinal "lens" through which the participant engages the subsequent practice. Duration: ~2 minutes.
Mindfulness Practice Modules
16 ten-minute blocks of bottom-up attentional instruction, spanning formal and informal contexts.
Active Control Analytical Framings
Each control intro establishes an analytical "lens" structurally matched to its mindfulness counterpart in duration and architecture, but directing top-down categorization rather than experiential sensing.
Active Control Practice Modules
16 ten-minute blocks of top-down analytical instruction, each structurally matched to a mindfulness counterpart on duration, prosody, format, and burden.
Theme and Practice Pairings (A–P)
The 16 theme–practice pairings used in the pre-registered Validation RCT (N = 360). Each pairing has a Mindfulness (M) and Active Control (C) version. Click column headers to sort.
Proof-of-concept deployment: what we found
A pre-registered, randomised, single-blind, parallel-group RCT deployed all 16 SOMA pairings simultaneously. Two of three pre-specified hypotheses were supported. The third — credibility equivalence — revealed a residual gap we document transparently. Full data, analysis pipeline, and pre-registration are publicly available.
What we tested, what we found
Each hypothesis had a pre-specified test, equivalence bound, and decision rule, registered on OSF and ClinicalTrials.gov before data collection began on 5 May 2026.
The mechanistic double dissociation
The cross-over pattern — the empirical signature of mechanistic orthogonality — was consistent across all 16 pairings and both practice types.
Mindfulness Condition
Active Control Condition
Participants correctly identified their condition's mechanism
After completing the audio, participants labelled the cognitive mechanism they had been engaging — providing instrument-independent corroboration of mechanistic separation.
The H1 credibility gap: transparent, not fatal
Why the credibility gap does not undermine the double dissociation
The CEQ assesses anticipated future therapeutic benefit — a forward-looking judgment susceptible to pre-existing cultural beliefs about mindfulness. The SMS and AES assess in-session mechanism engagement. These two things dissociate cleanly, and the pattern runs in the direction that refutes a demand characteristics account: Active Control participants scored higher on the AES despite rating the exercise as less credible. If expectancy were inflating responses, the Mindfulness condition should dominate both measures. It does not.
The Active Control was also rated as more cognitively demanding (d = 0.40), consistent with top-down analytical processing being effortful — which may compound the credibility gap independently of the exercise's perceived therapeutic logic. Instruction clarity ratings did not differ between conditions, suggesting the exercises were broadly comprehensible. Future iterations can address the gap through cover story refinement and titrated task density without altering the library's mechanistic architecture.
The SOMA Research Consortium
SOMA is the product of an international expert committee: two research scientists, three certified mindfulness instructors with experience working with diverse and underserved populations, a methodologist, and senior supervisory scientists.
The library was developed through a multi-month iterative process. All foundational design decisions — including theme selection, equity constraints, and structural matching standards — were established by the expert committee before any computational tools were employed. The three certified instructors brought specialist expertise delivering mindfulness to elderly populations, healthcare workers, neurodiverse and trauma-informed contexts, LGBTQIA+ communities, and other historically underserved groups — expertise that was essential to SOMA's equity mandate.
CRediT: Conceptualization, Methodology, Project Administration, Writing – Original Draft, Formal Analysis, Writing – Review & Editing.
CRediT: Conceptualization, Methodology, Materials Development (Active Control Design), Writing – Review & Editing.
CRediT: Methodology, Formal Analysis, Writing – Review & Editing.
Specialist expertise: Extensive experience delivering mindfulness programmes through non-profit organisations for elderly populations, caregivers, and educators working with individuals with special needs. Collaborator on a National University of Singapore study examining mindfulness and related interventions for couples undergoing IVF fertility treatment.
CRediT: Materials Development (Mindfulness Script Lead, Committee Coordinator), Methodology.
Specialist expertise: Author of Neurodiversity Tips for Mindfulness Teachers; specialist expertise in neurodiversity-affirming, trauma-sensitive, and LGBTQIA+-inclusive script design. Served as audio narrator for all 88 SOMA assets — providing a priori cross-cultural validation of the vocal delivery (same narrator as in a prior multi-site mindfulness trial, N = 2,239 across 37 sites).
CRediT: Materials Development (Mindfulness Script Development, Audio Narration).
CRediT: Materials Development (Mindfulness Script Development).
Acknowledgments
The committee's work was informed by a formative focus group conducted with five certified MBSR instructors as part of a prior pilot trial. We thank Amos Tanay and Amit Bernstein for personal communication regarding the SMS factor structure. SOMA materials may be used under the terms of the CC BY-NC-SA 4.0 license; for commercial licensing enquiries, please contact the A*STAR IHDP technology transfer office.
How SOMA Was Built
Developed through an iterative, multi-phase pipeline combining expert committee co-design, AI-assisted auditing, exploratory synthetic stress-testing, and independent parallel review by the two research scientists.
👥 Expert Committee Co-Design
An international working group of two research scientists (AS, JD) and three certified MBSR instructors (EL, CS, TM) collaboratively developed script content, structural equivalence standards, and pedagogical ordering. All foundational design decisions were established before any computational tools were employed. The committee brought specialist expertise in delivering mindfulness to diverse, underserved, and neurodiverse populations.
🔍 Semantic Compliance Audit
GPT-4o (temperature = 0.0) audited all 16 Active Control scripts against four operationalised criteria — Mechanism Purity, SES Safety, Radical Modularity, and Linguistic Accessibility — in fully stateless, independent API calls. Used as a development flag-raising tool: the committee reviewed all flagged items and decided on revisions.
🤖 Synthetic Stress-Test (Phase 4 → 5)
Two-phase quality control. Phase 4 (pre-revision; GPT-4o-mini, N = 256) identified scripts requiring redesign and informed iterative revision. Phase 5 (post-finalisation; gpt-5.4, N = 3,200) confirmed 0% leakage across all 16 finalised control scripts. Treated throughout as a linguistic quality-control filter, not a substitute for human data.
🔄 Attentional Object Shift Redesign
Phase 4 revealed the central methodological insight: mechanistic orthogonality requires redirecting the cognitive task itself, not merely substituting vocabulary. Nine control scripts were systematically redesigned to redirect attention from shared experiential anchors (breath, body, eating) to external or procedural targets while preserving motor equivalence.
📖 Cognitive Scaffolding
The 16 practices are organized into a three-tier scaffold based on the expert committee's clinical assessment of cognitive and interoceptive demands. Tier 1 establishes basic attention anchoring; Tier 2 introduces nuanced practices; Tier 3 addresses advanced interoception and affective observation. The structure reflects best practice for scaffolding naïve learners but is non-binding.
🎙️ Audio Standardization
All 88 assets recorded by the same certified instructor (CS) — same narrator as a prior large-scale multi-site trial (N = 2,239, 37 sites), providing a priori cross-cultural validation. Recording standard: warm-professional tone, 100–110 wpm pacing, standardized pause hierarchy (Short = 10 s, Long = 20–30 s, Final = 20 s), three-file delivery format (Intro, Practice, Full Session).
Three-Tier Practice Architecture
| Tier | Label | Description | Practices |
|---|---|---|---|
| Tier 1 | Foundational | Most accessible, core practices establishing basic attentional anchoring with minimal cognitive load using immediate sensory objects. | Awareness of Breath (F), Mindful Movements (G), Mindful Walking (H), Opening the Senses (A), Being with the Present (C), Listening Practice (K), Tuning in to Sounds (L), Being with the Senses (B) |
| Tier 2 | Core Extension | More nuanced or specialised practices integrating mindfulness into daily routines. | Brushing Teeth (E), Mindful Eating (M), Mindful Handwashing (P), Mindful Drinking (D) |
| Tier 3 | Specialized | Most conceptually complex practices — higher working memory and emotional tolerance, focusing on deeper interoception and transient affective observation. | Awareness of Body (I), Body Scan (N), Self-Compassion: Soothing Touch (O), Tuning in to the Body (J) |
How to Cite SOMA
Please use the following citation when referencing SOMA materials. Check the OSF page for the most current version.
License & Terms of Use
The SOMA Architecture is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
- Attribution (BY)You must cite the original SOMA research in any publications or distributions.
- NonCommercial (NC)Exclusively for public, clinical, and academic research. Prohibits monetized apps, paywalls, or for-profit wellness services. For commercial licensing enquiries, contact the A*STAR IHDP technology transfer office.
- ShareAlike (SA)Adaptations must be distributed under this same license. No additional DRM or restrictive terms.
- DisclaimerMaterials provided "as is" without warranties. Creators assume no liability for claims or outcomes.
Principle 1: Structural Equivalence
Unlike passive waitlist controls, SOMA Active Controls are matched to mindfulness scripts on five critical structural dimensions, eliminating common confounds including expectancy, instructor attention, and session burden.
| Dimension | Standard Applied |
|---|---|
| Duration | Identical ~12 min commitment (±30 seconds across all 32 scripts) |
| Narration | Same certified instructor (CS); matched warm-professional tone, 100–110 wpm |
| Architecture | Intro → Universal Bridge → Practice structure maintained across both conditions |
| Word Count | 898–959 words per script (closely matched between conditions); identical pause syntax markers |
| Reading Level | Grade 5–6 (Flesch–Kincaid) verified via Hemingway Editor |
Principle 2: Mechanistic Orthogonality
The Active Control is designed as Analytical Training. While mindfulness cultivates direct bottom-up sensing, the control directs top-down categorization and analytical verification. This design produces a predicted double dissociation: mindfulness participants score higher on the State Mindfulness Scale (SMS), while control participants score higher on the Analytical Engagement Scale (AES), with both conditions scoring equivalently on the Credibility/Expectancy Questionnaire (CEQ).
Mechanistic orthogonality requires redirecting the cognitive task itself, not merely substituting vocabulary. Analytical vocabulary applied to the same sensory focus (breath, body, walking) produces leakage. The control task must redirect attention to external, procedural, or measurement-based targets while preserving motor equivalence where possible.
For the majority of pairings, the control script operates within the same behavioural domain as its mindfulness anchor (e.g., both eating throughout the practice). Where the anchor is inherently somatic (e.g., breath awareness in Pairing F), domain matching would reintroduce experiential processing — equivalence is therefore preserved at the level of practice format (formal, seated, matched duration) and the control redirects attention to a purely cognitive task.
Principle 3: Intervention Design Rationale
The SOMA library operationalises the consensus that mindfulness is a synergistic combination of attentional regulation and specific attitudinal qualities (Bishop et al., 2004; Shapiro et al., 2006). Each module pairs a top-down thematic framing (Introduction) with a bottom-up attentional task (Practice).
The thematic toolkit spans a pedagogical spectrum. Being and Curiosity establish basic sensory grounding. Patience and Acceptance develop distress tolerance. Letting Go and Gentleness train cognitive flexibility and self-compassionate affect.
Formal practices (e.g., body scans) train sustained interoceptive awareness. Informal practices (e.g., handwashing, brushing teeth) embed mindfulness into daily routines — disrupting behavioral automaticity without increasing time-burden. Both are critical for ecological validity in low-resource populations.
Principle 4: Equity by Design
Accessibility is a foundational constraint in SOMA, not a post-hoc analysis. The library was developed by an expert committee including three certified MBSR instructors with extensive experience delivering mindfulness to diverse, underserved, and neurodiverse populations.
All scripts refined to Grade 5–6 reading level (Flesch–Kincaid, verified via Hemingway Editor). Secular framing: all spiritual or contemplative jargon prohibited.
Instructions explicitly welcome environmental noise. The "quiet space" prerequisite — which systematically excludes participants in dense urban or multi-occupancy settings — is eliminated by design. All employment and workplace references removed from control scripts.
Principle 5: Validation Study Design
A pre-registered RCT (N = 360, Anglophone Prolific sample with quota-sampled high-/low-SES strata) tests three hypotheses: structural equivalence (H1: CEQ TOST, d = ±0.40), mechanistic orthogonality (H2: 2 × 2 Condition × Measure interaction), and SES-related accessibility (H3: exploratory). The Validation RCT serves as empirical proof-of-concept for the library.
Pre-registration (OSF: osf.io/m76cg; ClinicalTrials.gov: NCT07556744), analysis plan, stimuli, and all supplementary materials available at: osf.io/m76cg →