What is a key characteristic of intermittent reinforcement?

Intermittent reinforcement is characterized by providing rewards not on every instance of a desired behavior, but rather at varied and unpredictable intervals. This unpredictability can lead to a more durable form of behavior because the individual does not know when the next reward might come, which can reinforce the behavior more effectively over time. For example, a slot machine in a casino pays out sporadically; because players do not know when they will win, they tend to play longer and more frequently, reinforcing their gambling behavior.

In contrast, consistent rewards or those given for every instance of a behavior (the other options) are characteristic of continuous reinforcement, which can lead to rapid learning but is typically less effective for maintaining a behavior over the long term compared to intermittent reinforcement. Additionally, intermittent reinforcement is not limited to emergency situations, which further distinguishes it from the other choices.