Final answer:
The statement is false because the removal of a reinforcer in response cost does not have to be immediate; the timing of the removal can vary and should be understood by the individual for effective behavior modification.
Step-by-step explanation:
The statement "in response cost, removal of a reinforcer is always immediate" is false. Response cost is a behavior modification technique where a certain amount of a specific reinforcer is removed after an undesirable behavior has occurred. However, the removal does not necessarily have to be immediate. The effectiveness of the response cost may vary depending on the timing of the reinforcement removal, and sometimes a delay can make the consequence clear without being disruptive. In practice, it's crucial that the person undergoing the behavior modification understands the contingency between their behavior and the removal of the reinforcer to help modify their behavior accordingly.