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Head injury criterion

The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact.

Version
v1 · 2026-09-28 · History
Domain-specific #
9810
Domain group
Applied Sciences & Engineering
Origin domain
Engineering & Design (beyond software)
Subdomains
Automotive Safety Engineering, Injury Biomechanics → Engineering & Design (beyond software)

Core Idea

Head injury criterion is treated here as the recurring formal models and representations identity summarized by this source-grounded definition: The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact.

The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The HIC can be used to assess safety related to vehicles, personal protective gear, and sport equipment. Normally the variable is derived from the measurements of an accelerometer mounted at the center of mass of a crash test dummy’s head, when the dummy is exposed to crash forces.

\mathit{H}\mathit{I}\mathit{C} = \max_{t_1,t_2} \bigg{ (t_{2}-t_{1})\cdot \bigg[\frac{1}{t_{2}-t_{1}}. \int_{t_{1}}^{t_{2}} a(t) dt \bigg]^{2.5} \bigg}. where t 1 and t 2 are the initial and final times (in seconds) chosen to maximize HIC, and acceleration a is measured in gs (standard gravity acceleration).

For Head injury criterion, the abstraction is narrower than the article's general subject matter: a positive case must preserve The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. Retaining only the name, a familiar example, or a downstream effect is insufficient. The specialist roles and tests remain anchored in formal models and representations, which is why this identity is domain-specific rather than prime.

Structural Signature

Sig role-phrases:

  • Defining carrier — National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety.
  • Constitutive relation — According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion.
  • Operating condition — A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle.
  • Recognition evidence — A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997).
  • Admissible variation — A "severe" injury is one with a score of 4+ on the Abbreviated Injury Scale (AIS).
  • Characteristic consequence — Data for specific vehicles can be found on various automotive review websites.
  • Failure boundary — The 1998 Ford Windstar, marketed as one of the safest minivans of that year, tested out to a HIC=305 score for driver.

What It Is Not

  • Not the whole field of formal models and representations. The node requires the specific identity stated by The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact.
  • Not an over-broad reading. National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety.
  • Not an over-broad reading. According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion.
  • Not an over-broad reading. A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle.
  • Not automatically Hannan–Quinn information criterion. Retrieval proximity does not establish equivalence; the two identities must be compared by carrier, operation, and failure boundary.

Scope of Application

Head injury criterion applies literally inside formal models and representations wherever the source-defined carrier and relation can be established. Its documented habitats include:

  • Automobile safety. HIC is used to determine the U.S.
  • Automobile safety. Some sample data is as follows, for comparative purposes.
  • Documented setting. The HIC can be used to assess safety related to vehicles, personal protective gear, and sport equipment.
  • Automobile safety. National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety.
  • Automobile safety. According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion.
  • Automobile safety. A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle.

Outside formal models and representations, the name should be retained only when these same operational conditions survive; otherwise the comparison belongs to the broader parent Theory or should be marked as analogy.

Clarity

A clear use of Head injury criterion names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The strongest recognition evidence in the frozen account is: A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997). A report should distinguish that evidence from a proxy, consequence, or common implementation. It should also state the qualification National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety. so that a reader can reproduce the classification rather than infer it from topical resemblance.

Manages Complexity

Head injury criterion compresses multiple formal models and representations details into a stable diagnostic relation. The source shows both the central mechanism—according to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion.—and the practical consequence—data for specific vehicles can be found on various automotive review websites. This compression makes cases comparable while leaving parameters, conventions, exceptions, and evidential quality explicit. It is lossy by design: local history and implementation details may be omitted only when they do not alter the defining relation.

Abstract Reasoning

  1. Type the carrier. Identify the formal models and representations entities to which the claim applies.
  2. State the relation. Use the source-grounded identity: The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact.
  3. Check operation and conditions. A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle.
  4. Demand recognition evidence. A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997).
  5. Test variation. Change an implementation or setting while preserving a "severe" injury is one with a score of 4+ on the Abbreviated Injury Scale (AIS).
  6. Run the collapse test. Remove the defining operation; if the label still seems equally apt, only a topic or correlate was retained.
  7. Reduce cautiously. When the specialist conditions cannot be carried, route the residual comparison to Theory.

Knowledge Transfer

Within the home domain. Knowledge about Head injury criterion transfers literally when a new case preserves the same carrier type, relation, and recognition test. HIC is used to determine the U.S. Some sample data is as follows, for comparative purposes.

Beyond the home domain. Transfer the broader Measurement relation when the formal models and representations-specific differentia cannot be filled. Retain the name Head injury criterion only when the same carrier, operation, and rejection conditions are present literally rather than metaphorically.

Examples

Canonical

National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety. This case is canonical because it supplies a concrete carrier and lets the defining relation be checked rather than merely named.

Mapped back: carrier → the entities in the documented case; operation → The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact; recognition evidence → A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997)

Applied / In Practice

According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion. The applied case shows how the identity is used under a second setting or qualification while keeping the same operative relation.

Mapped back: changed setting → Automobile safety; invariant → The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact; boundary → the case exits the class when national Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety

Structural Tensions

T1 — Stable identity versus admissible variation. National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Which changes preserve the defining relation, and which replace it?

T2 — Recognition versus proxy. According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the cited evidence establish the identity or only a correlated sign?

T3 — Definition versus implementation. A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Is the observed implementation constitutive, optional, or merely common?

T4 — Scope versus overextension. A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997). The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Can every claimed application fill the same typed roles without metaphor?

T5 — Transfer versus domain accent. National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the receiving case instantiate Head injury criterion literally, co-instantiate Theory, or only resemble it?

T6 — Autonomy versus reduction. According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: What does Head injury criterion distinguish that the broader parent Theory leaves together?

Structural–Framed Character

Head injury criterion is mixed or framed-leaning. Its structural side is the repeatable organization summarized by The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. Its framed side is the formal models and representations vocabulary that fixes the carrier, evidence, exceptions, and admissible transformations.

Evaluative weight: the identity can be stated descriptively even when applications carry practical stakes. Human-practice dependence: the source-grounded carrier determines whether the relation exists independently or is constituted by a practice. Institutional origin: disciplinary conventions stabilize the name and test. Vocabulary portability: A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle. Import versus recognition: literal transfer requires the same mechanism; shape alone is analogy.

Its portable skeleton is Theory. Its character: a recurring specialist identity whose thin organization can be abstracted, while its operational meaning remains domain-bound.

Structural Core vs. Domain Accent

What is skeletal. The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The reviewed portable genus is Measurement; the candidate preserves that parent relation across admissible variants. The source-grounded carrier and relation are expressed by these conditions: National Highway Traffic Safety Administration (NHTSA) star rating for automobile safety and to determine ratings given by the Insurance Institute for Highway Safety. According to the Insurance Institute for Highway Safety, head injury risk is evaluated mainly on the basis of head injury criterion. The recognition and variation tests add: A value of 700 is the maximum allowed under the provisions of the U.S. advanced airbag regulation (NHTSA, 2000) and is the maximum score for an "acceptable" IIHS rating for a particular vehicle. A HIC-15 (meaning a measure of impact over 15 milliseconds) of 700 is estimated to represent a 5 percent risk of a severe injury (Mertz et al., 1997).

What is domain-bound. formal models and representations fixes the carrier, technical vocabulary, admissible evidence, and exceptions that distinguish Head injury criterion from other Measurement instances. Its documented habitat includes the condition that HIC is used to determine the U.S. A second source-grounded application condition is that Some sample data is as follows, for comparative purposes. Those details determine what the words denote, what observations warrant classification, and which apparent similarities are false positives.

Why the node remains domain-specific. Removing the formal models and representations differentia leaves the parent rather than the candidate. The edge records that reduction without claiming that every topical neighbor is hierarchical. The final collapse test is source-specific: A "severe" injury is one with a score of 4+ on the Abbreviated Injury Scale (AIS). If that condition or the defining relation is absent, the case may instantiate Measurement, but it is not Head injury criterion.

This entry is a kind of Measurement.

  • Immediate parent — Measurement (subsumption). Head injury criterion is a domain-specific kind of Measurement. Head injury criterion is a strict kind of Measurement: The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The parent supplies the necessary broader identity—Mapping a target's attribute onto a scale via an instrument and procedure, yielding a value-plus-uncertainty tied to a unit and frame.—while the candidate adds its domain carrier, relation, and rejection conditions.
  • Other nearby abstractions. Retrieval neighbors remain comparison surfaces only; no additional parent is asserted without a necessary-genus or structural-prerequisite test.

Relationships to Other Abstractions

Local relationship map for Head injury criterionParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Head injury criterionDOMAINPrime abstraction: Measurement — is a kind ofMeasurementPRIME

Current abstraction Head injury criterion Domain-specific

Parents (1) — more general patterns this builds on

  • Head injury criterion is a kind of Measurement Prime

    Head injury criterion is a strict kind of Measurement: The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact.

Hierarchy path (1) — routes to 1 parentless root

Neighborhood in Abstraction Space

Head injury criterion sits in a sparse region of the domain-specific corpus (90th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Unclustered & Miscellaneous (2551 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08

Not to Be Confused With

  • Theory. The parent omits the specialist differentia. Tell: Can the case establish The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact?
  • Hannan–Quinn information criterion. In statistics, the Hannan–Quinn information criterion (HQC) is a criterion for model selection. Tell: Which entry's carrier, operation, and failure condition are satisfied?
  • Human Factors Analysis and Classification System. Classify an operational accident through four ordered causal strata— organizational influences, unsafe supervision, preconditions for unsafe acts, and unsafe acts—so investigation climbs past the visible operator error and routes intervention to the layer that generated it. Tell: Which entry's carrier, operation, and failure condition are satisfied?
  • Attribute Hierarchy Method. Diagnose learners' mastery by arranging cognitive attributes in a prerequisite hierarchy, deriving feasible response patterns, and matching observed item responses to those patterns. Tell: Which entry's carrier, operation, and failure condition are satisfied?
  • A measurement, proxy, or consequence. Those may provide evidence without being the identity. Tell: Would Head injury criterion remain present if the detector or downstream effect changed?
  • A metaphorical analogue. A similar shape outside formal models and representations lacks the specialist mechanism. Tell: Do the native roles transfer literally, or only the parent Theory?

References

  • Frozen Wikipedia discovery revision: https://en.wikipedia.org/wiki/Head_injury_criterion (revision 1330993986).
  • Preserved source candidate: http://www.mchenrysoftware.com/HIC%20and%20the%20ATB.pdf
  • Preserved source candidate: http://www.health.uottawa.ca/biomech/courses/apa6903/CrashTests%20and%20the%20HIC.pdf
  • Preserved source candidate: https://web.archive.org/web/20110706211423/http://www.health.uottawa.ca/biomech/courses/apa6903/CrashTests%20and%20the%20HIC.pdf
  • Preserved source candidate: http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA458677
  • Preserved source candidate: https://web.archive.org/web/20130409222827/http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA458677
  • Preserved source candidate: https://www.ias.ac.in/article/fulltext/sadh/032/04/0397-0408
  • Preserved source candidate: http://www.iihs.org/ratings/protocols/pdf/measures_frontal.pdf
  • Preserved source candidate: https://web.archive.org/web/20110101135952/http://www.iihs.org/ratings/protocols/pdf/measures_frontal.pdf

The frozen Wikipedia revision is discovery provenance. The retained source set was reviewed for identity, formal or operational relation, and scope. The encyclopedia's structural synthesis is bounded to those claims; a thin authority surface is recorded as a nonblocking source-strengthening repair rather than concealed.