The framework's position that simulation fidelity is a patient safety consideration in medical and rehabilitation contexts.
This document states the SFR framework's position on the relationship between simulation fidelity and patient safety. It establishes that simulation classification tier carries structural information relevant to patient safety decisions in medical and rehabilitation contexts, defines the framework's boundary with clinical decision-making, and identifies the domains in which this position is most applicable.
The SFR framework's position is that simulation fidelity is a patient safety consideration in medical, rehabilitation, and high-risk training contexts that involve participants whose neurological reserve may be reduced, whose nervous systems are in active recovery, or whose response to sensory conflict may differ from neurologically typical populations.
This position does not claim that any specific simulation system harms any specific participant. It proposes that the structural properties of the simulation environment — specifically, the degree to which it may generate compensatory demand through sensory incoherence — are relevant variables for patient safety decision-making, and that classification tier is the most structurally reliable indicator of those properties currently available within this framework.
Safety in this context means that simulation programs involving medically or neurologically complex populations should include simulation tier as one of the variables considered in program design, alongside clinical assessment, participant capacity, session structure, and organizational protocols. Excluding tier from those considerations means excluding structural information about the sensory environment that the nervous system will experience.
The Human Outcomes Layer's chain — sensory fidelity, neurological processing, neurological adaptation, training transfer — establishes the mechanism by which simulation architecture affects human outcomes. In medical and rehabilitation contexts, the relevant safety considerations arise from two elements of that chain:
Participants with reduced neurological reserve may experience a different relationship between compensatory demand and available processing capacity than neurologically typical participants. When compensatory demand approaches available reserve, the nervous system's capacity to manage both conflict resolution and therapeutic or training objectives may be reduced. Simulation tier affects the structural likelihood of compensatory demand being generated.
A nervous system in recovery that is exposed to a sensory environment that generates incoherent inputs may adapt toward those incoherent patterns as well as toward the intended rehabilitation targets. Whether this constitutes a safety concern depends on the specific rehabilitation context and the degree of incoherence — but it is a structural implication of the adaptation mechanism that clinical decision-makers should be aware of when selecting simulation environments for rehabilitation use.
Participants with vestibular disorders, post-concussion vestibular sensitivity, or age-related vestibular decline may respond differently to vestibular inputs — including incoherent vestibular inputs generated by Surface-Level simulation. The degree to which this is a safety concern depends on individual clinical factors, but simulation tier provides information about the structural likelihood of incoherent vestibular inputs being delivered.
Rehabilitation gains that do not transfer from the simulation environment to the real-world environment are not therapeutically meaningful. If a rehabilitation program's safety rationale depends on the participant developing real-world capabilities, then the transfer potential of the simulation environment — which is affected by tier — is a safety-relevant variable in addition to a training effectiveness variable.
The framework's safety position applies most directly to contexts in which the participant populations and program objectives intersect with the structural implications of simulation tier. The following domains are identified as those in which simulation tier should be considered as a patient safety variable:
Neurological rehabilitation. Programs using simulation to support recovery from stroke, TBI, concussion, or other neurological events. These populations may have reduced neurological reserve, and the adaptation direction produced by the simulation environment is directly relevant to the rehabilitation objective.
Vestibular rehabilitation. Programs using simulation to retrain vestibular processing or compensate for vestibular dysfunction. These populations have vestibular systems that are in active remodeling, and the coherence of vestibular inputs in the simulation environment is directly relevant to whether the therapeutic environment supports or complicates that process.
Motor rehabilitation for medically complex populations. Programs in which participants have reduced capacity to manage additional sensory processing demands alongside motor rehabilitation objectives. This includes aging populations, populations with neurodegenerative conditions, and populations in acute recovery from systemic illness.
High-risk training for populations with known neurological or vestibular conditions. Training programs in motorsport, aviation, or other high-performance domains in which participants are known to have conditions associated with reduced neurological reserve. In these contexts, the structural implications of tier for compensatory demand are relevant to participant welfare decisions.
The SFR framework's safety position establishes that simulation tier is relevant structural information for patient safety decisions. It does not cross the boundary into clinical practice, treatment protocols, or individual participant assessment. The following distinctions are explicit:
The SFR framework classifies simulation systems by tier (In-the-Loop, Surface-Level, Out-of-the-Loop). It defines the structural properties of each tier in relation to sensory coherence, compensatory demand, and training transfer potential. It proposes that these structural properties are relevant to patient safety in medical and rehabilitation contexts. It provides canonical terminology for discussing these properties in clinical and organizational settings.
The SFR framework does not screen individual participants for suitability for any simulation tier. It does not prescribe protocols for any medical or rehabilitation application. It does not determine whether any specific participant should or should not participate in a specific simulation program. It does not make safety determinations for individuals. These decisions are clinical and organizational responsibilities that require qualified healthcare professionals and cannot be delegated to a classification framework.
The Ethics and Safety document — Ethics and Safety Framework — addresses the framework's broader ethical positions. See Reduced Neurological Reserve and Fidelity and Rehabilitation for the specific population and rehabilitation positions. See System Classification for the tier definitions on which all safety-relevant tier information is grounded.