physics

Graduated electronic decelerator

Graduated electronic decelerator is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Graduated electronic decelerator rather than just read about it. In short: The graduated electronic decelerator (GED) is a torture device that delivers powerful electric shocks to the skin. Created by Matthew Israel for use on people at the Judge Rotenberg Center as part of the institution's behavior modification program, the device and the school's punishment program have been condemned as torture by the United Nations special rapporteur on torture.

Key takeaways

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Reference excerpt

The graduated electronic decelerator (GED) is a torture device that delivers powerful electric shocks to the skin. Created by Matthew Israel for use on people at the Judge Rotenberg Center as part of the institution's behavior modification program, the device and the school's punishment program have been condemned as torture by the United Nations special rapporteur on torture. In 2020, the device was banned in the United States by the Food and Drug Administration; however, the ban was overturned in federal court a year later. In 2023, the United States Congress amended the Food, Drug, and Cosmetic Act, expanding the FDA's authority to ban such devices. The FDA proposed a new ban based on its expanded authority in March 2024 and accepted public comments on the proposal through May 2024. After allowing two previous self-imposed deadlines (October 2025 and May 2026) to pass, the agency announced in July 2026 that it would make a final decision on the proposed ban by November 2026. Matthew Israel created the GED to replace the older punishments of spankings, pinches, and muscle squeezes, but continued to use restraints, sensory deprivation, and the withholding of food. These older punishments were often used in combination with the GED: For example, a student could be restrained to a board and then given several GED shocks in succession. While the school advertises its behavior modification program as safe, effective, and backed by science, these claims are disputed by independent experts, and the device has been condemned as a form of torture.

History The GED was created by Matthew Israel, the founder of Judge Rotenberg Center. Before it made use of electric shocks, the school used pinches, spankings, muscle squeezes, and a wide variety of other methods of aversive intervention including punitive restraints, sensory deprivation, and the withholding of food. Matthew Israel said that the school moved to electric shocks because “A lot of injuries were occurring” and also because it is more consistent. After the school began to use electric shocks as punishment, it phased out pinches, spankings, and muscle squeezes, but retained most other aversion interventions which were used alongside, and sometimes at the same time as, the electric shocks. For example, it was a common punishment to apply multiple GED shocks while the subject was restrained. The GED is based on the Self-Injurious Behavior Inhibiting System (SIBIS), a controversial device that delivered electric shocks to the skin for the purpose of inhibiting self-harming behavior. The SIBIS delivers a weak skin shock that lasts 0.2 seconds. The JRC used the SIBIS on 29 students between 1988 and 1990, but, in some cases, the shock was not powerful enough to produce compliance. Matthew Israel reported that one student was shocked by the SIBIS over 5,000 times in a day without producing the desired change in behavior. Israel asked the manufacturer of the SIBIS, Human Technologies, to build a device that delivered stronger shocks, but they refused. Israel then designed the GED-1, which could deliver a much more powerful shock than the SIBIS, that would last ten times as long. In 1994, the United States Food and Drug Administration (FDA) cleared the device for the treatment of self-harming behavior, as they considered it "substantially equivalent" to the SIBIS. By 1992, Matthew Israel had also designed and deployed the GED-3a and GED-4. These new GEDs were built to deliver much more powerful shocks than the original GED-1, and were never cleared for use by the FDA. Israel stated that he created the more powerful devices "Because some students had adapted to the [GED-1]". In 2000, the FDA incorrectly notified the JRC that it qualified for exemption from registration of the GED-3a and GED-4. When the FDA recognized this error in 2011, it notified the JRC that the devices were not approved for use and ordered that they stop using them. The JRC ignored the FDA's demands and continued to use the devices until they were banned in 2020. At the time of the ban, the GED-3a and GED-4 were the only versions of the GED in use at the center. The use of the device was condemned as torture by the United Nations. The use of the GED has been condemned by human rights groups and disability rights organizations. In 2020, it became the third device ever banned by the FDA in the history of the organization. In 2021, a federal court found that the FDA ban was an "inappropriately promulgated rule". The FDA rule was a ban on using these devices to treat violent or self-injurious behaviors, while not banning the device for "other purposes". A three-judge panel of the U.S. Court of Appeals for the D.C. Circuit found that this was an overstep of its authority, as it cannot regulate the practice of medicine. In 2023, Congress amended the Federal Food, Drug, and Cosmetic Act, expanding the FDA's authority and allowing them to ban a medical device for a particular use, irrespective of any other approved use. The FDA proposed a new ban based on its expanded authority in March 2024 and accepted public comments on the proposal through May 2024. As of July 2026, the agency has not acted on its proposal, despite previous self-imposed deadlines of October 2025 and May 2026. In a May 2026 statement to Disability Scoop, United States Department of Health and Human Services spokesperson Andrew Nixon said the FDA was still considering comments received. An unnamed government spokesperson did not respond to a June 2026 request for comment submitted by a Stat reporter. In July 2026, the FDA announced a new self-imposed deadline of November 2026.

Specifications and design Three versions of the GED are known to have been used: The GED-1, GED-3a, and GED-4. Of these devices, the GED-1 is the least powerful and the GED-4 is the most powerful. The GED-1 produces a shock of 30 mA, lasting two seconds. The GED-4 produces a shock of 90 mA, lasting two seconds. For comparison, a cattle prod produces a shock of not more than 10 mA lasting a fraction of a second. According to James Eason, a professor of biomedical engineering at Washington and Lee University, the GED's lowest shock setting is about twice the threshold that pain researchers consider tolerable to most adult humans.

Use

Intended use

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Illustrations

Worked examples

Example 1 — a first encounter with Graduated electronic decelerator

Start with the simplest possible case. Write down what Graduated electronic decelerator claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Graduated electronic decelerator before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Graduated electronic decelerator ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Graduated electronic decelerator

In research: Graduated electronic decelerator appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Graduated electronic decelerator in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Graduated electronic decelerator is common in secondary-school and first-year university syllabi. It links to neighbouring topics American inventions, Autism pseudoscience, Behavior modification, so understanding it makes those chapters shorter.
In everyday life: Look for Graduated electronic decelerator outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Graduated electronic decelerator in 20 minutes

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Frequently asked questions

What is Graduated electronic decelerator in simple terms?

Why does Graduated electronic decelerator matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Graduated electronic decelerator?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Graduated electronic decelerator.