Luisa’s therapist delivers reinforcement on an FR1 schedule…

Luisa’s therapist delivers reinforcement on an FR1 schedule when Luisa correctly stacks two matching blocks on top of one another. The therapist delivers reinforcement on an FR4 schedule when Luisa points to the matching blocks. Luisa can do either of these actions freely, and neither is directed by the therapist. This is an example of what type of schedule of reinforcement?