science

Three-term contingency

Three-term contingency is a science 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 Three-term contingency rather than just read about it. In short: The three-term contingency (also known as the ABC contingency) is a psychological model describing operant conditioning in three terms consisting of a behavior, its consequence, and the environmental context, as applied in contingency management. The three-term contingency was first defined by B.

Key takeaways

Three-term contingency belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Three-term contingency to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Three-term contingency from memory before moving on to harder problems.

Reference excerpt

The three-term contingency (also known as the ABC contingency) is a psychological model describing operant conditioning in three terms consisting of a behavior, its consequence, and the environmental context, as applied in contingency management. The three-term contingency was first defined by B. F. Skinner in the early 1950s. It is often used within ABA to alter the frequency of socially significant human behavior.

Components

Antecedent The antecedent stimulus occurs first in the contingency and signals that reinforcement or punishment is available on the contingency of a specific behavior. A discriminative stimulus, or SD, directly affects the likelihood of a specific response occurring.

Behavior The behavior, also referred to as the response, is any observable and measurable action a living organism can do. In the three-term contingency, behavior is operant, meaning it changes the environment in some way.

Consequence

The consequence of a behavior can be reinforcing or punishing. Reinforcing consequences increase the likelihood of a behavior occurring in the future; it is further divided into positive and negative reinforcement. Punishing consequences decrease the likelihood of a behavior occurring in the future; like reinforcement, it is divided into positive and negative punishment. An example of punishment may include beatings (positive punishment), and taking away something desired or loved (negative punishment). The effectiveness and value of a consequence are determined by the motivating operations the organism has. For example, deprivation of food can make food more effective as a consequence, and the satiation of hunger can make food less effective as a consequence.

References

Worked examples

Example 1 — a first encounter with Three-term contingency

Start with the simplest possible case. Write down what Three-term contingency claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Three-term contingency 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 Three-term contingency 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 Three-term contingency

In research: Three-term contingency appears in science 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 Three-term contingency 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: Three-term contingency is common in secondary-school and first-year university syllabi. It links to neighbouring topics B. F. Skinner, Behavioral concepts, so understanding it makes those chapters shorter.
In everyday life: Look for Three-term contingency 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 Three-term contingency in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Three-term contingency means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Three-term contingency out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Three-term contingency in simple terms?

Why does Three-term contingency matter?

Because it connects several science 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 Three-term contingency?

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 Three-term contingency.