Contingency-shaped behavior

Direct consequences shape later responding

A commuter tries several buttons on an unfamiliar ticket machine. Selections that open the correct screen become more likely, while selections that lead to an error screen decline. The changing pattern may be contingency shaped because the person contacts the results of each action.

The consequence must be connected to a defined response and later change in that response class. Mere sequence is insufficient. A screen may appear after a tap without affecting future taps. Lattal’s conceptual review describes contingency as a functional relation with empirical, theoretical, and practical dimensions, not simple closeness in time.

Rules can guide action before direct experience

A rule describes some part of a contingency, such as, “Choose day pass, then tap confirm.” A person can follow it before discovering the machine’s effects through trial and error. Rules can speed safe learning, preserve knowledge, and help people act under delayed or rare consequences.

Tarbox and colleagues discuss rule following as behavior with its own learning history. Their small teaching study does not supply a universal protocol or a simple test for whether one response was rule governed.

The two sources can work together

After following instructions, the commuter also contacts the result. Later behavior may reflect the original rule, successful machine use, social feedback, prior experience with similar screens, or several influences at once.

Calling a response “contingency shaped” requires more evidence than knowing that consequences occurred. Calling it “rule governed” requires more than knowing that instructions were present. Imitation, prompts, stimulus similarity, and previous learning may also matter.

Sensitivity can differ after conditions change

Contingency-shaped responding may adjust as consequences change. Rule following can persist when an old instruction no longer matches current conditions, especially when following trusted rules has been reinforced. This is a possible pattern, not a universal contrast. People can check rules against outcomes, revise instructions, and respond flexibly.

Clinical teams should define the changed contingency and measure how behavior changes across opportunities. A single delayed adjustment cannot identify the source of control.

Assessment starts with a functional question

Useful questions include:

• What exact response is being measured?
• Which direct consequences have followed it?
• Which rules, models, prompts, or reminders were available?
• Has the rule been accurate in this setting?
• What happened when the direct contingency changed?
• Can the person describe another reason for the choice?

The BACB BCBA Test Content Outline, 6th edition includes rule-governed and contingency-shaped behavior within examination content. It is not an assessment method or authorization for a clinical interpretation.

A fictional mixed-control record

Arjun is learning to buy a reduced-fare transit ticket. During ten practice opportunities with immediate screen feedback and no step-by-step rule, he completes 8 of 10 purchases. In a later set of ten opportunities with a spoken sequence but a different machine layout, he completes 6 of 10.

Those counts describe two different arrangements. They do not show that practice caused the higher result or that the second set was controlled only by the rule. Machine layout, order, familiarity, fatigue, prompts, and consequence history differ. The team records errors by screen, checks whether Arjun wants written or visual instructions, and tests the updated support on the same layout.

Teaching should preserve choice and feedback

Rules work best when they are accurate, understandable, accessible, and open to correction. Direct practice should be safe and meaningful. A person needs a way to ask questions, decline a goal, report that the rule is wrong, and access ordinary support.

Do not remove communication, food, water, bathroom access, mobility, rest, prescribed care, or emergency help to create direct consequences. Clinical experiments involving risk belong with qualified professionals and applicable safeguards.

Measure the claimed source of control

Report correct responses divided by eligible opportunities, the rule available on each trial, prompts, consequences, changes in the environment, and the person’s report. Keep training and independent probes separate.

When a rule changes, document whether the direct contingency changes too. When only the contingency changes, preserve the rule so the comparison is interpretable. Even a carefully planned comparison supports a functional hypothesis within the tested conditions rather than a fixed label for the person.

Review rules when the environment changes

Rules should name their source, date, setting, and exception path when accuracy matters. After equipment, policy, or safety conditions change, check the rule against current direct evidence. Invite the person who follows it to report conflicts. Updating a rule is part of good instruction, while repeated errors may show that the environment or support needs revision.