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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.

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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.

Scope of Application

  • 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.

  • 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.

  • Documented setting. Generally, the only important element of these voltage traces is the occurrence of spikes in the voltage, representing action potentials.

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.

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.

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.

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.

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