6.2 Antecedent Interventions: NCR, High-Probability, and Demand Fading

Preventive strategies before behavior occurs

Antecedent interventions are proactive parts of a behavior reduction plan. They change what happens before target behavior so the behavior is less likely to occur or so appropriate behavior is more likely to contact reinforcement. The 2026 RBT Test Content Outline names examples such as noncontingent reinforcement, high-probability request sequences, and demand fading. The RBT does not select these because they sound helpful. The RBT follows the supervisor's written procedure, uses the exact schedule or sequence, collects data, and reports whether the strategy was feasible in the real setting.

Noncontingent reinforcement, often called NCR, means providing a reinforcer on a time-based schedule rather than because the client emitted the target behavior. If behavior has been maintained by attention, the plan might tell the RBT to provide brief attention every two minutes before problem behavior occurs. If behavior has been maintained by tangible access, the plan might schedule short, predictable access to the item. The word noncontingent does not mean random.

The RBT needs a timer, clear delivery rules, a description of what to do if target behavior happens near the scheduled delivery, and data procedures for whether the schedule was followed.

High-probability request sequences use a series of easy, likely-to-be-completed requests before a lower-probability request. A plan might say, give three mastered one-step directions with praise after each response, then present the toothbrushing step. The goal is to build momentum and contact reinforcement before a difficult demand. Fidelity errors are common: using requests that are not actually easy, giving too many requests, skipping reinforcement, presenting the difficult demand harshly, or turning the sequence into bargaining.

The RBT follows the exact request list or selection rule provided by the supervisor.

Demand fading gradually increases task requirements after the client is successful with smaller requirements. If writing a full paragraph evokes escape behavior, the plan may begin with writing one word, then one sentence, then two sentences, based on data and supervisor-set criteria. Demand fading is not simply letting the client do less whenever behavior occurs. The RBT must know the starting demand, the criteria for moving up, the reinforcement for cooperation, and what to do when target behavior occurs. Any change to the fading steps belongs to the supervisor, not the RBT acting alone.

Timing changes the meaning of an antecedent strategy. In NCR, attention delivered before target behavior may reduce motivation for attention-maintained behavior. Attention delivered immediately after the target behavior may reinforce it. A two-minute schedule that turns into a ten-minute schedule may stop functioning as intended. In a busy classroom, the RBT may need a discreet timer, clear staff coordination, and a plan for transitions. If the schedule cannot be followed because the environment changes, the RBT documents the barrier and alerts the supervisor instead of quietly improvising.

Antecedent interventions are often paired with teaching replacement behavior. For example, NCR may reduce repeated calling out, while functional communication training teaches the client to request attention appropriately. Demand fading may make work more tolerable, while differential reinforcement strengthens task engagement or break requests. The RBT should not treat prevention as a way to avoid teaching. If the plan includes both preventive steps and consequence steps, both need implementation. Data must show whether the client is learning replacement responses, not only whether the day was calmer.

Decision workflow for an antecedent procedure:

1. Read the written plan before the session and identify the exact schedule, sequence, or demand level.
2. Prepare materials, timers, reinforcers, and data sheets before the client arrives.
3. Deliver the antecedent strategy before target behavior, not as a reaction unless the plan says so.
4. Reinforce the appropriate response described in the plan.
5. Continue consequence procedures for target behavior exactly as written.
6. Record fidelity barriers, target behavior, replacement behavior, and client response.
7. Ask the supervisor before changing timing, demands, reinforcer type, or criteria.

Consider a clinic session where the client often engages in loud vocalizations when a preferred adult leaves. The supervisor writes an NCR attention schedule: every 90 seconds, the RBT gives 10 seconds of neutral conversation or labeled praise while the adult is nearby, then gradually thins the schedule only after supervisor review. The RBT should not wait until loud vocalizations begin and then provide extra attention. The RBT should also avoid adding lectures or emotional language.

The useful report is practical: the schedule was followed for 18 of 20 intervals, loud vocalizations occurred twice, both after missed deliveries during a transition, and the replacement attention request occurred four times.

In school or home settings, antecedent procedures can be affected by other people. A caregiver may offer an item after target behavior because they want the episode to end. A teacher may skip the high-probability sequence because the class is moving quickly. The RBT should respond professionally: protect dignity, continue the part of the protocol they can implement, avoid correcting others in front of the client, and report the barrier to the supervisor. The supervisor can train the team, adjust the plan, or clarify roles.