What type of reinforcement schedule involves some responses being reinforced while others are not?

The type of reinforcement schedule that involves some responses being reinforced while others are not is known as an intermittent schedule. This schedule is characterized by the fact that reinforcement is not provided every time a desired response occurs, which is in contrast to a continuous schedule where every response is reinforced. Intermittent reinforcement can take various forms, such as fixed ratio, variable ratio, fixed interval, or variable interval, but the key feature of all these forms is that reinforcement is delivered only occasionally. This unpredictability encourages sustained engagement and can lead to more robust behavior patterns, as the individual learns that some responses will result in reinforcement, while others may not. In practical applications, such as in behavior modification or learning environments, using an intermittent schedule can be highly effective in establishing and maintaining behavior over time.