Applied Behavior Analysis Technician (ABAT) Practice Test

What is defined as a reinforcer?

1. A stimulus that always decreases behavior

2. A stimulus presented or removed that increases behavior

3. A stimulus that has no effect on behavior

4. A stimulus present that leads to immediate consequences

The correct answer is: A stimulus presented or removed that increases behavior

A reinforcer is defined as a stimulus that is presented or removed following a behavior, leading to an increase in the frequency of that behavior. This concept is fundamental in applied behavior analysis as it relates to operant conditioning. When a reinforcer follows a behavior, it creates a positive association, making the individual more likely to repeat that behavior in the future. In this context, the reinforcement can either be a positive reinforcement (where a pleasant stimulus is presented) or negative reinforcement (where an unpleasant stimulus is removed). Both methods result in an increase in the likelihood of the desired behavior occurring again. The other options do not accurately capture the definition of a reinforcer. For instance, a stimulus that decreases behavior, has no effect, or merely leads to immediate consequences does not fulfill the function of increasing the likelihood of a behavior being repeated, which is the hallmark of a reinforcer. Thus, the correct choice effectively encapsulates the role of a reinforcer in behavior modification.