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Accommodation Index

The accommodation index is a statistic used in the neurosciences for describing spike train data.

Version
v1 · 2026-09-28 · History
Domain-specific #
7849
Domain group
Natural Sciences
Origin domain
Neuroscience
Subdomains
Spike Train Analysis, Computational Neuroscience → Neuroscience

Core Idea

Accommodation Index is treated here as the recurring formal models and representations identity summarized by this source-grounded definition: The accommodation index is a statistic used in the neurosciences for describing spike train data.

The accommodation index is a statistic used in the neurosciences for describing spike train data. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons. Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.

It is often useful to be able to describe the data in terms of the spike timings; for instance, when optimizing a compartmental model towards observed behaviour, statistics such as this can be used to gauge error. Various statistics are used to do this, such as spike rate (i.e., frequency of action potentials), average interspike interval (ISI, time interval between two subsequent action potentials), and the accommodation index (AP). It is similar to other measures of accommodation such as the local variance introduced by Shinomoto et al. in 2003.

For Accommodation Index, the abstraction is narrower than the article's general subject matter: a positive case must preserve The accommodation index is a statistic used in the neurosciences for describing spike train data. 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.

How would you explain it like I'm…

Zap Timing Number

Brain cells talk by making quick little blips. Scientists record when each blip happens and look at the gaps between them. The accommodation index is one number they work out from those blips to describe the pattern of their timing.

Spike Pattern Score

When scientists measure a nerve cell with electrodes, they get a wiggly voltage line, and what matters most are the sudden spikes, which are the cell's signals. To describe a string of spikes, called a spike train, they use numbers such as how often the cell spikes and the average time between spikes. The accommodation index is another of these numbers, describing how the timing of spikes behaves through the train. Scientists use numbers like this to check whether a computer model of a nerve cell behaves like the real one.

Spike Train Accommodation Statistic

In neuroscience, electrophysiology experiments record the voltage of individual neurons, and usually what matters in those traces is when spikes - action potentials - occur. So the data are often summarized by statistics of spike timing. Common ones include the spike rate (how often action potentials occur) and the average interspike interval (the time between one spike and the next). The accommodation index is another such statistic for describing spike trains, related to how the neuron's firing adapts over the train, and it is similar to other measures of accommodation such as the local variance. These statistics are useful, for instance, when tuning a detailed computer model of a neuron so its behavior matches recordings: differences in the statistics measure the model's error.

 

The accommodation index is a descriptive statistic for spike train data. Electrophysiological recordings produce voltage traces from individual neurons in which, for most purposes, only the occurrence times of spikes (action potentials) matter, so the traces are reduced to spike timings and summarized by statistics. Alongside spike rate and mean interspike interval, the accommodation index characterizes the timing structure of the train in terms of accommodation, the change in firing across a sustained train; it is comparable to other accommodation measures such as the local variance introduced by Shinomoto and colleagues in 2003. A key use is model fitting: when a compartmental neuron model is optimized toward observed behavior, differences between modeled and measured statistics such as this one serve as the error measure. The concept is specifically a spike-train statistic, not a general property of neurons or a generic measure of excitability.

Structural Signature

Sig role-phrases:

  • Defining carrier — It is similar to other measures of accommodation such as the local variance introduced by Shinomoto et al. in 2003.
  • Constitutive relation — It is defined by the average of the difference in length of two consecutive interspike intervals (ISIs) normalized by the summed duration of these two ISIs.
  • Operating condition — The accommodation index is a statistic used in the neurosciences for describing spike train data.
  • Recognition evidence — Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.
  • Admissible variation — Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.
  • Characteristic consequence — It is often useful to be able to describe the data in terms of the spike timings; for instance, when optimizing a compartmental model towards observed behaviour, statistics such as this can be used to gauge error.
  • Failure boundary — Various statistics are used to do this, such as spike rate (i.e., frequency of action potentials), average interspike interval (ISI, time interval between two subsequent action potentials), and the accommodation index (AP).

What It Is Not

  • Not the whole field of formal models and representations. The node requires the specific identity stated by The accommodation index is a statistic used in the neurosciences for describing spike train data.
  • Not an over-broad reading. Where N is the number of APs and k determines the number of ISIs that will be disregarded in order not to take into account possible transient behavior as observed in Markram et al., 2004.
  • Not an over-broad reading. The accommodation index is a statistic used in the neurosciences for describing spike train data.
  • Not an over-broad reading. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.
  • Not automatically Neural accommodation. Retrieval proximity does not establish equivalence; the two identities must be compared by carrier, operation, and failure boundary.

Scope of Application

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

  • Documented setting. The accommodation index is a statistic used in the neurosciences for describing spike train data.
  • Documented setting. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.
  • Documented setting. It is often useful to be able to describe the data in terms of the spike timings; for instance, when optimizing a compartmental model towards observed behaviour, statistics such as this can be used to gauge error.
  • Documented setting. Various statistics are used to do this, such as spike rate (i.e., frequency of action potentials), average interspike interval (ISI, time interval between two subsequent action potentials), and the accommodation index (AP).
  • Documented setting. Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.
  • Documented setting. It is similar to other measures of accommodation such as the local variance introduced by Shinomoto et al. in 2003.

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 Measurement or should be marked as analogy.

Clarity

A clear use of Accommodation Index names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is The accommodation index is a statistic used in the neurosciences for describing spike train data. The strongest recognition evidence in the frozen account is: Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons. A report should distinguish that evidence from a proxy, consequence, or common implementation. It should also state the qualification Where N is the number of APs and k determines the number of ISIs that will be disregarded in order not to take into account possible transient behavior as observed in Markram et al., 2004. so that a reader can reproduce the classification rather than infer it from topical resemblance.

Manages Complexity

Accommodation Index compresses multiple formal models and representations details into a stable diagnostic relation. The source shows both the central mechanism—it is defined by the average of the difference in length of two consecutive interspike intervals (ISIs) normalized by the summed duration of these two ISIs.—and the practical consequence—it is often useful to be able to describe the data in terms of the spike timings; for instance, when optimizing a compartmental model towards observed behaviour, statistics such as this can be used to gauge error. 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 accommodation index is a statistic used in the neurosciences for describing spike train data.
  3. Check operation and conditions. The accommodation index is a statistic used in the neurosciences for describing spike train data.
  4. Demand recognition evidence. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.
  5. Test variation. Change an implementation or setting while preserving generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.
  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 Measurement.

Knowledge Transfer

Within the home domain. Knowledge about Accommodation Index transfers literally when a new case preserves the same carrier type, relation, and recognition test. The accommodation index is a statistic used in the neurosciences for describing spike train data. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.

Beyond the home domain. No canonical parent is asserted for Accommodation Index. An outside case receives the specialist name only when the same typed roles and rejection conditions can be filled literally; otherwise the comparison remains an analogy pending later graph densification.

Examples

Canonical

It is often useful to be able to describe the data in terms of the spike timings; for instance, when optimizing a compartmental model towards observed behaviour, statistics such as this can be used to gauge error. 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 accommodation index is a statistic used in the neurosciences for describing spike train data; recognition evidence → Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons

Applied / In Practice

Various statistics are used to do this, such as spike rate (i.e., frequency of action potentials), average interspike interval (ISI, time interval between two subsequent action potentials), and the accommodation index (AP). 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 → the applied context; invariant → The accommodation index is a statistic used in the neurosciences for describing spike train data; boundary → the case exits the class when where N is the number of APs and k determines the number of ISIs that will be disregarded in order not to take into account possible transient behavior as observed in Markram et al., 2004

Structural Tensions

T1 — Stable identity versus admissible variation. Where N is the number of APs and k determines the number of ISIs that will be disregarded in order not to take into account possible transient behavior as observed in Markram et al., 2004. 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. The accommodation index is a statistic used in the neurosciences for describing spike train data. 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. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons. 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. Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials. 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. It is similar to other measures of accommodation such as the local variance introduced by Shinomoto et al. in 2003. 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 Accommodation Index literally, co-instantiate Measurement, or only resemble it?

T6 — Autonomy versus reduction. It is defined by the average of the difference in length of two consecutive interspike intervals (ISIs) normalized by the summed duration of these two ISIs. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: What does Accommodation Index distinguish that the broader parent Measurement leaves together?

Structural–Framed Character

Accommodation Index is mixed or framed-leaning. Its structural side is the repeatable organization summarized by The accommodation index is a statistic used in the neurosciences for describing spike train data. 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: The accommodation index is a statistic used in the neurosciences for describing spike train data. Import versus recognition: literal transfer requires the same mechanism; shape alone is analogy.

Its portable skeleton is Measurement. 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 accommodation index is a statistic used in the neurosciences for describing spike train data. The stable skeleton is the typed relation expressed in that definition and the entry's recognition and collapse tests. The source identifies these operative conditions: It is similar to other measures of accommodation such as the local variance introduced by Shinomoto et al. in 2003. It is defined by the average of the difference in length of two consecutive interspike intervals (ISIs) normalized by the summed duration of these two ISIs. It further constrains recognition and variation through: The accommodation index is a statistic used in the neurosciences for describing spike train data. Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons.

What is domain-bound. formal models and representations supplies the operative entities, technical vocabulary, warrants, and exceptions that make Accommodation Index literal. Its documented scope includes the condition that The accommodation index is a statistic used in the neurosciences for describing spike train data. Another bounded application condition is that Many methods of experimental neuroscience, especially the electrophysiological methods, give their output in the form of measured voltages of individual neurons. These are not decorative examples; they determine which carrier and evidence can fill the abstraction's roles.

Why no parent is asserted. Removing those specialist details does not currently yield one live catalog node that is a necessary genus for every instance. The entry is therefore approved as unparented rather than attached by topical resemblance. Its collapse evidence remains specific—Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.—and future graph densification may discover a defensible relation only if it preserves that boundary.

This entry under conditions is a kind of Measurement Scale.

  • Approved unparented node. No current live node supplies a defensible necessary genus or structural prerequisite for Accommodation Index. The reviewed identity is: The accommodation index is a statistic used in the neurosciences for describing spike train data. The accelerated suggestion was declined because topical or lexical similarity does not establish hierarchy; the node is admitted without a parent pending later graph densification.
  • Related reasoning operations. Evidence, representation, comparison, classification, transformation, or evaluation may participate in particular cases, but participation does not make any one of them a necessary parent of every instance.

Relationships to Other Abstractions

Local relationship map for Accommodation IndexParents 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.Accommodation IndexDOMAINDomain-specific abstraction: Measurement Scale — is a kind of, conditionalMeasurementScaleDOMAIN

Current abstraction Accommodation Index Domain-specific

Parents (1) — more general patterns this builds on

  • Accommodation Index is a kind of, conditional Measurement Scale Domain-specific

    Supported if it is a defined index scale mapping accommodation or policy response.

    Condition / exception Supported if it is a defined index scale mapping accommodation or policy response.

Hierarchy path (1) — routes to 1 parentless root

Neighborhood in Abstraction Space

Accommodation Index sits in a sparse region of the domain-specific corpus (70th 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

  • Measurement. The parent omits the specialist differentia. Tell: Can the case establish The accommodation index is a statistic used in the neurosciences for describing spike train data?
  • Neural accommodation. Neural accommodation or neuronal accommodation occurs when a neuron or muscle cell is depolarised by slowly rising current (ramp depolarisation) in vitro. The Hodgkin–Huxley model also shows accommodation. Sudden depolarisation of a nerve evokes propagated action potential by activating voltage-gated fast sodium channels incorporated in the cell membrane if the depolarisation is strong enough to reach threshold. The open sodium channels allow more sodium ions to flow into the cell and resulting in further depolarisation, which will subsequently open even more sodium channels. At a certain mome. Tell: Which entry's carrier, operation, and failure condition are satisfied?
  • Sleep tracking. Repeated monitoring and estimation of sleep timing, duration, continuity, stages, and related behavior using diaries, wearables, bedside sensors, or clinical instruments. Tell: Which entry's carrier, operation, and failure condition are satisfied?
  • Swedish Interactive Thresholding Algorithm. An adaptive static-perimetry algorithm family that continuously updates a visual-field model from patient responses and stops testing each location when a specified threshold-certainty criterion is met. 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 Accommodation Index 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 Measurement?

References

  • Frozen Wikipedia discovery revision: https://en.wikipedia.org/wiki/Accommodation_index (revision 1297729478).
  • Preserved source candidate: http://infoscience.epfl.ch/record/117800

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.