What is a reinforcer in the context of ABA?

In the context of Applied Behavior Analysis (ABA), a reinforcer is defined as a stimulus that follows a behavior and increases the likelihood of that behavior being repeated in the future. This definition aligns with the principle of reinforcement, which is a fundamental concept in behavior modification.

Positive reinforcement involves presenting a desirable stimulus after a desired behavior occurs, thereby encouraging that behavior to happen again. For example, if a child receives praise (the reinforcer) after completing their homework, they are more likely to repeat that behavior in the future.

Reinforcers can be tangible items, social interactions, or any other type of stimulus that the individual finds rewarding. This effectiveness of a reinforcer is largely dependent on the individual’s preferences and the context in which the behavior occurs.

The other responses center on concepts that do not reflect the core definition of reinforcement. For instance, eliminating or decreasing a behavior's occurrence relates more to punishment or extinction rather than reinforcement, indicating practices that reduce behaviors rather than increase them. A stimulus that reinforces a negative behavior does not address the purpose of reinforcement, which is aimed at increasing desirable behaviors. Therefore, the definition centered on the following stimulus that boosts the likelihood of a behavior is the correct depiction of a reinforcer in ABA.