PWR-221 · Synthetic Senses, Digital Twins & Extended Cognition

Physiological digital twin

A digital twin is not a second you. It is a limited, versioned model of selected variables, useful only for the question and population in which it has been validated.

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Revision 7T · Full Tutorial Edition · Release manifest · Methodology · Corrections

One source of teaching truth

Canonical Power learning unit · TLU-PWR-221

The learner produces a one-page evidence audit that identifies the twin’s target, data, omissions, validation population, prediction error, uncertainty, update rules and prohibited decisions.

Canonical Power page
PWR-221 · Physiological digital twin
Full tutorial
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Practical authority
The tutorial teaches a complete research method; operational self-experiment is excluded.
Current treatment
Full research tutorial
Research depth
deep · 7 bound sources
Risk framing
critical
Capability self-practice
Research method only; no operational self-experiment
Pathway membership
G-CUR-022

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Explanation is not permission.

This dossier explains the evidence and its limits. It is not a diagnosis, personal recommendation, assessment, clearance, performance promise or training programme. Actionable teaching appears only when the canonical Power record explicitly authorises it.

Complete bounded explanation

What this power means.

Capability to develop or express physiological digital twin in a declared context without inheriting broader claims.

What the current evidence supports

A physiological digital twin is a context-specific computational model that may approximate selected patient responses; it is not a trainable human power or a complete digital copy of a person.

How to observe or measure it without overclaiming

Predeclare clinical question, inputs, missingness, model/version, comparator, calibration/discrimination/error, subgroup performance, uncertainty, update policy and outcome; no wearable or model score alone diagnoses a person.

Myth

Build a perfect digital copy of your body

Metric

Context-specific prediction error, calibration, uncertainty, subgroup validity and clinical utility

Boundary

A limited physiological model cannot reproduce a whole person or authorize diagnosis and treatment.

Negative and limiting findings

  • The sepsis model showed variable agreement and common coding, expert-rule and timing errors; patient benefit and cross-setting transport were not established.

Claims this evidence cannot support

  • Your exact digital clone
  • Predict your body perfectly
  • Replace a clinician
  • Simulate any treatment safely

Individual tutorial · FULL RESEARCH TUTORIAL

How to learn this Power now.

The learner produces a one-page evidence audit that identifies the twin’s target, data, omissions, validation population, prediction error, uncertainty, update rules and prohibited decisions.

  1. Get readyChoose a non-personal source that exposes methods and validation details; do not use a live clinical dashboard.
  2. Learn the method9 concrete steps teach the permitted method from start to finish.
  3. See right and wrong4 comparisons show correct or safer execution beside common wrong or riskier choices.
  4. PractiseAudit one additional paper or regulator document each week for four weeks, alternating internally validated and externally evaluated examples. Progress by adding decision-impact evidence, not by handling personal data.
  5. Check progressScore 12 required fields—target, horizon, population, inputs, omissions, provenance, version, comparator, calibration/error, subgroups, drift and prohibited use—as supported, absent or unclear, with a source location for each supported field.

Authority boundary: Titan teaches a complete Power-specific research method because operational capability practice is not currently justified. The method is Power-specific; its actionability follows this treatment.

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Related Powers: PWR-217 · PWR-218 · PWR-219 · PWR-220

Direct evidence register

Sources that support—and limit—the claim.

Citation roles are explicit. A source may support existence or trainability while simultaneously limiting transfer, certainty, generalisation or safety.

  1. Primary empirical supportLimiting / contrary
    Development and Verification of a Digital Twin Patient Model to Predict Specific Treatment Response During the First 24 Hours of Sepsis

    A Lal; G Li; E Cubro; S Chalmers; H Li; V Herasevich; Y Dong; B W Pickering; O Kilickaya; O Gajic · 2020 · Primary research

  2. Limiting / contraryOfficial boundary context
    Artificial Intelligence Risk Management Framework (AI RMF 1.0)

    Elham Tabassi; National Institute of Standards and Technology · 2023 · Official authority

  3. Limiting / contraryOfficial boundary context
    NIST Privacy Framework: A Tool for Improving Privacy Through Enterprise Risk Management, Version 1.0

    National Institute of Standards and Technology · 2020 · Official authority

  4. Limiting / contraryOfficial boundary context
    Credibility of Computational Models Program: Research on Computational Models and Simulation Associated with Medical Devices

    U.S. Food and Drug Administration, Office of Science and Engineering Laboratories · 2023 · Official authority

  5. Limiting / contraryOfficial boundary context
    Clinical Decision Support Software

    U.S. Food and Drug Administration · 2026 · Official authority

  6. Limiting / contraryOfficial boundary context
    Cybersecurity in Medical Devices: Quality Management System Considerations and Content of Premarket Submissions

    United States Food and Drug Administration · 2026 · Official authority

  7. Limiting / contraryOfficial boundary context
    Marketing Submission Recommendations for a Predetermined Change Control Plan for Artificial Intelligence-Enabled Device Software Functions

    U.S. Food and Drug Administration · 2025 · Official authority

Current teaching and evidence boundary

The next gate remains visible.

External confirmation is required before higher-authority use because: a clinical, high-risk or regulated configuration; a supervision or non-attempt boundary; cultural, community-rights or affected-person authority; a restricted safety or legitimacy boundary.

A Power-specific tutorial is available at /tutorials/pwr-221/. It contains a plain-English method, 9 ordered steps, a worked example, right-versus-wrong comparisons, specific mistakes and corrections, practice, measurement, accessibility, stopping rules and evidence. Its research mode remains controlling.