What Is Noncontingent Reinforcement?
Noncontingent reinforcement (NCR) is an antecedent-based intervention in which a stimulus, typically identified as a reinforcer for problem behavior, is delivered on a time-based schedule regardless of whether the target behavior occurs. The term "noncontingent" refers to the fact that delivery is not dependent on any specific response from the individual.
NCR was first described in the applied literature by Vollmer, Iwata, Zarcone, Smith, and Mazaleski (1993), who demonstrated its effectiveness in reducing self-injurious behavior maintained by attention. Since then, it has become one of the most widely studied and recommended antecedent interventions in applied behavior analysis.
How NCR Works: Behavioral Mechanisms
NCR reduces problem behavior through two primary mechanisms:
- Abolishing operation (AO) effect: By providing the reinforcer freely and frequently, NCR reduces the motivating operation for the problem behavior. If a child engages in aggression to gain attention, providing attention on a dense time schedule diminishes the value of attention as a reinforcer, thereby reducing the motivation to engage in aggression.
- Extinction effect: Because the reinforcer is delivered independently of the target behavior, the response-reinforcer contingency is disrupted. Over time, the behavior is no longer reliably followed by reinforcement, which functions similarly to extinction.
Research by Hagopian, Crockett, van Stone, DeLeon, and Bowman (2000) demonstrated that both mechanisms contribute to the effectiveness of NCR, although the AO effect is often considered the primary driver of behavior reduction during the initial dense schedule phase.
Step-by-Step Implementation of NCR
Step 1: Conduct a Functional Assessment
Before implementing NCR, you must identify the function of the problem behavior. NCR is a function-based intervention, meaning you deliver the specific reinforcer maintaining the behavior. Conducting a functional behavior assessment (FBA) or functional analysis (FA) is essential. NCR using a non-matched reinforcer may be less effective or may inadvertently reinforce other problem behaviors.
Step 2: Select the Initial Schedule
Begin with a dense schedule of reinforcer delivery, typically a fixed-time (FT) schedule. To determine the initial schedule value, calculate the mean inter-response time (IRT) of the problem behavior during baseline. Set the initial FT schedule at or below this IRT to ensure the reinforcer is available more frequently than the individual would typically access it through problem behavior.
Step 3: Deliver the Reinforcer on Schedule
Deliver the identified reinforcer at the predetermined time intervals regardless of what the individual is doing. For example, if the function is attention and the schedule is FT 30 seconds, provide attention every 30 seconds irrespective of the individual's current behavior.
Step 4: Thin the Schedule Gradually
Once problem behavior has decreased to acceptable levels, begin thinning the NCR schedule. Increase the time between reinforcer deliveries gradually, such as moving from FT 30 seconds to FT 1 minute, then FT 2 minutes, and so on. Monitor behavior data carefully during thinning. If problem behavior increases, return to the previous schedule value before attempting to thin again.
Step 5: Pair with Other Interventions
NCR is often most effective when combined with other procedures. Consider pairing NCR with differential reinforcement of alternative behavior (DRA) or functional communication training (FCT) to teach appropriate replacement behaviors. Some practitioners also pair NCR with extinction of the problem behavior, though NCR can be effective without a formal extinction component.
Clinical Examples Across Functions
Attention-Maintained Behavior
A student disrupts class by calling out to gain teacher attention. After confirming the attention function through an FA, the teacher delivers brief positive attention (praise, conversation) on an FT 2-minute schedule. The student receives attention frequently enough that calling out decreases because the motivating operation for attention is weakened.
Escape-Maintained Behavior
A client engages in aggression to escape academic demands. NCR for escape involves providing brief breaks from demands on a fixed-time schedule. The practitioner pauses instruction every 3 minutes for a 30-second break, regardless of the client's behavior. Over time, aggression decreases as the value of escape is diminished by the freely available breaks.
Automatic Reinforcement
NCR for automatically reinforced behavior involves providing matched stimulation on a time-based schedule. For stereotypic hand flapping hypothesized to produce proprioceptive stimulation, the practitioner may provide access to vibrating toys or sensory items on an FT schedule. Piazza, Adelinis, Hanley, Goh, and Delia (2000) demonstrated the effectiveness of this approach for automatically reinforced behavior.
Common Mistakes and Misconceptions
- Using NCR without a functional assessment: Delivering a preferred item on a time schedule is not the same as NCR. True NCR requires identification of the specific reinforcer maintaining the problem behavior.
- Starting with a schedule that is too lean: If the initial schedule is not dense enough, the individual may still find it more efficient to engage in problem behavior to access the reinforcer.
- Thinning too quickly: Rapid schedule thinning often leads to resurgence of problem behavior. Thin conservatively and use data to guide decisions.
- Confusing NCR with noncontingent access: Simply providing free access to preferred items is not the same as systematically delivering the functional reinforcer on a timed schedule with planned thinning.
BCBA Exam Relevance
NCR appears frequently on the BCBA exam under the Applications content area. Expect questions about identifying when NCR is appropriate, selecting initial schedule values, understanding the AO versus extinction mechanisms, and troubleshooting schedule thinning. You should also be prepared to distinguish NCR from differential reinforcement procedures and to explain why functional assessment is a prerequisite for effective NCR implementation.