Similar Endpoints Can Hide Different Internal Pathways

Source Claim: PD-CLAIM-131: Across the ladder, no single joint force, clock delay, or torque sign defines useful transfer; model optimization should report event-window force, couple, power, work, constraint, endpoint, and robustness diagnostics together, without promoting this conditional framework to coaching advice.
Source-Reported Claim Status: supported
Source-Declared Model Domain: Research design implications from the declared reduced models.
Source Uncertainty Boundary: No universal human control strategy is identified.
Editorial Alternative: Different admissible command and contact histories can produce the same selected endpoint observable. Matching speed alone does not match the full terminal state or internal history.
Editorial Discriminating Comparison: Declare the endpoint map, event and matching tolerance; compare full state, work, loads, constraints and robustness among matched outcomes. Separately test model interventions from the same complete dynamical state.
Source-Reported Falsifier: A robust governed human study establishes a simpler sufficient strategy or current text prescribes technique.
Editorial Review Question: Does selecting only endpoint speed make distinct internal mechanisms appear equivalent by construction?
Critique Ledger Disposition: crit-simulation-tautology: open
Readiness Record: ad-protocol-model-ladder-001: simulation-ready (modeled)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

docs/research/proximal_distal_energy_transfer/data/mechanism_ladder_study.json
docs/research/proximal_distal_energy_transfer/data/mechanism_ladder_traces.npz
scripts/research/proximal_distal_energy/run_mechanism_ladder_study.py
scripts/research/proximal_distal_energy/mechanism_ladder.py
tests/research/test_mechanism_ladder_evidence.py
tests/research/test_mechanism_ladder.py

A Timing Change Is Not Automatically Beneficial Transfer

Source Claim: PD-CLAIM-237: Exact 30 ms same-state killswitches give nonmonotonic channel effects: continued torso and wrist commands add 1.223 and 1.818 m/s, whereas continued bilateral-arm commands reduce delivery speed by 1.364 m/s in the registered program.
Source-Reported Claim Status: supported
Source-Declared Model Domain: One exact same-state branch within the declared rotating-base mechanism.
Source Uncertainty Boundary: A channel continuation effect is conditional on state, commands, model, and endpoint; it is not an anatomical or coaching effect.
Editorial Alternative: Continuing a specified command channel can change both timing and the delivery objective. That conditional intervention effect does not identify a universal benefit of the observed sequence.
Editorial Discriminating Comparison: Branch the registered model at the same event and complete state, including any activation or compliance states. Declare the command-removal operation, other command histories or feedback policies, endpoint rule and uncertainty; compare objective, work and loads together.
Source-Reported Falsifier: Pre-branch states differ or branch recomputation reverses the recorded channel differences.
Editorial Review Question: Is an observed timing change being treated as beneficial without a matched objective and intervention?
Critique Ledger Disposition: crit-sequencing-lie-bracket-fallacy: open
Readiness Record: ad-protocol-neural-timing-001: simulation-ready (manufactured-synthetic)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

docs/research/proximal_distal_energy_transfer/data/rotating_base_torso_velocity_study.json
docs/research/proximal_distal_energy_transfer/data/claim_numeric_reported_values.json

Attribution Depends on Coordinates and Endpoint Mapping

Source Claim: PD-CLAIM-306: Virtual-work least squares reports a minimum-norm force-only endpoint equivalent together with rank and unreconstructed generalized residual; signed/absolute tangent impulse, power, and work remain distinct observables.
Source-Reported Claim Status: supported
Source-Declared Model Domain: Exact planar double-pendulum generalized coordinates with a frozen bounded torque-program grid and an impact-truncated endpoint mapping.
Source Uncertainty Boundary: A rank-deficient force-only equivalent is not a complete grip wrench, and generalized component work is not automatically subsystem transfer.
Editorial Alternative: Coordinate partitions and unweighted least-squares metrics can change attributed components and the fitted force. The reconstructed generalized drive includes the retained residual; a force-only fit need not identify the complete physical wrench.
Editorial Discriminating Comparison: Transform the same physical trajectory, generalized covectors, Jacobian and residual metric consistently. Check total virtual power and reconstruction in one observer frame; report rank, residual and fitted-force sensitivity separately. Do not demand invariance of arbitrary component allocations.
Source-Reported Falsifier: The mapped force and retained residual do not reconstruct the generalized drive, or undefined zero-speed tangent intervals contribute to integration.
Editorial Review Question: Does a named generalized component survive a change of coordinates and physical endpoint representation?
Critique Ledger Disposition: crit-control-causality-mechanical: responded
Readiness Record: ad-protocol-model-ladder-001: simulation-ready (modeled)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

docs/research/proximal_distal_energy_transfer/data/force_source_optimization.json
docs/research/proximal_distal_energy_transfer/figures/fig_force_source_optimization.pdf
scripts/research/proximal_distal_energy/force_source_optimization.py
scripts/research/proximal_distal_energy/run_force_source_optimization.py
src/shared/python/biomechanics/force_source_attribution.py
tests/research/test_force_source_optimization.py
tests/unit/biomechanics/test_force_source_attribution.py

One Net Club Wrench Does Not Identify Two Hand Loads

Source Claim: PD-CLAIM-068: Two-hand common and differential modes are mechanically distinct: opposing contact forces can cancel in the resultant while generating a couple or internal squeeze, and equal club action does not identify joint loading, co-contraction, robustness, or effort strategy.
Source-Reported Claim Status: supported
Source-Declared Model Domain: Declared planar two-contact wrench geometry; external context is multifinger prehension and one instructed fast two-hand grasp task.
Source Uncertainty Boundary: The external studies are not golf, do not rank golf strategies, and do not validate the model's quantitative force allocation.
Editorial Alternative: Equal-and-opposite force increments preserve resultant force but generally change its moment. Increments along the line joining ideal point contacts can preserve the complete wrench while changing individual contact loads, subject to admissibility constraints.
Editorial Discriminating Comparison: Express synchronized bilateral force-and-moment measurements about one reference point and frame, with calibration and uncertainty. Check net-wrench closure and admissible nullspace changes. These measurements constrain contact allocation, not unique muscle effort or co-contraction.
Source-Reported Falsifier: Common/differential reconstruction fails or measured golf contact forces uniquely identify effort from net wrench alone.
Editorial Review Question: Is a net club wrench being used to infer individual-hand loading, effort, or muscle coordination?
Critique Ledger Disposition: crit-ztcf-identifiability: open
Readiness Record: ad-protocol-bilateral-hand-wrench-001: simulation-ready (manufactured-synthetic)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

https://doi.org/10.3200/JMBR.40.5.446-476
https://doi.org/10.1007/BF00198762
tests/research/test_hand_path_attribution_study.py

Base Constraints Change the Modeled Coupling

Source Claim: PD-CLAIM-159: Within this coupled tier, separated force moment arms can create a late negative club couple, the couple can persist after same-state command removal, and endogenous base motion and shaft flex do not automatically remove it; explicit sign, branch, geometry, closure, and convergence failures would contradict the result.
Source-Reported Claim Status: supported
Source-Declared Model Domain: Synthesis of registered reference, intervention, geometric control, and convergence evidence.
Source Uncertainty Boundary: The synthesis establishes mechanical possibility only, not prevalence, benefit, optimality, or human causation.
Editorial Alternative: A fixed ideal support can exchange momentum while doing zero work at its stationary contact. A prescribed moving base can supply or remove mechanical energy. A finite-mass dynamic base changes the coupled response; none of these facts alone disproves a late negative couple.
Editorial Discriminating Comparison: Map compatible physical initial states and event rules across fixed, prescribed and dynamic-base models. Include support reactions and prescribed-base power in the chosen system boundary; test sign, reconstruction, convergence and geometry controls without treating unlike models as the same experiment.
Source-Reported Falsifier: Any enumerated falsification condition occurs under the registered executable study without correction.
Editorial Review Question: Would the apparent mechanism persist when base motion is endogenous rather than prescribed or fixed?
Critique Ledger Disposition: crit-effective-plant-fallacy: open
Readiness Record: ad-protocol-model-ladder-001: simulation-ready (modeled)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

docs/research/proximal_distal_energy_transfer/data/moving_base_flexible_study.json
docs/research/proximal_distal_energy_transfer/data/moving_base_flexible_study.npz
scripts/research/proximal_distal_energy/moving_base_flexible_club.py
scripts/research/proximal_distal_energy/run_moving_base_flexible_study.py
tests/research/test_moving_base_flexible_club.py
tests/research/test_moving_base_flexible_evidence.py

Shaft Recoil, Actuation, Damping, and Contact Are Confounded

Source Claim: PD-CLAIM-144: The model motivates only the hypothesis that elastic storage changes timing and configuration, while matched endpoint performance depends on actuation, damping, and endpoint rather than peak strain alone.
Source-Reported Claim Status: untested
Source-Declared Model Domain: One torsional coordinate over a broad grid.
Source Uncertainty Boundary: No general recoil benefit or negligibility is shown.
Editorial Alternative: Shaft deformation stores energy, but the sign and timing of its release, damping, contact and continuing actuation determine delivery. Equal peak deformation does not specify endpoint speed or an energetic benefit.
Editorial Discriminating Comparison: Declare either a fixed-command comparison of endpoint outcomes or a matched-delivery comparison of required inputs and losses. Keep the endpoint definition and event rule fixed, account for changed inertia and contact, and measure deformation and boundary power. Do not silently impose both identical commands and identical outcomes.
Source-Reported Falsifier: Calibrated paired tests reject the relationship.
Editorial Review Question: Is peak shaft strain being credited as beneficial recoil without matching actuation, damping, contact, and endpoint?
Critique Ledger Disposition: crit-stiffness-pulse-paradox: open
Readiness Record: ad-protocol-equipment-response-001: simulation-ready (manufactured-synthetic)
Registered Validation Release: unavailable: Obtain an immutable verified #4042 release reference.
Registered Workflow: unavailable: No qualified provider workflow record is registered for this atlas card. This is a limitation of the atlas registration, not a claim that no software or measurements exist elsewhere.

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Evidence artifacts

docs/research/proximal_distal_energy_transfer/data/shaft_contribution_study.json
docs/research/proximal_distal_energy_transfer/data/shaft_contribution_traces.npz
scripts/research/proximal_distal_energy/flexible_shaft_study.py
scripts/research/proximal_distal_energy/run_shaft_contribution_study.py
tests/research/test_flexible_shaft_study.py
tests/research/test_shaft_contribution_evidence.py