This increase in taking medication is an example of what principle of learning?

Extinction refers to the gradual weakening and eventual disappearance of a conditioned response when it is no longer reinforced. In this scenario, the taking of medication is not diminishing; rather, it is being reinforced by the relief it provides. Thus, extinction does not apply as it does not lead to an increase in behavior.

Punishment aims to decrease a behavior by introducing an aversive consequence or removing a pleasant stimulus following the behavior. In this context, taking medication is not being punished; instead, it is a behavior that is reinforced by the positive outcome of feeling better, making punishment an inappropriate label.

Spontaneous recovery is the re-emergence of a conditioned response after a pause following extinction. This concept does not relate to the consistent behavior of taking medication to avoid discomfort; therefore, it is not relevant to the scenario where the behavior is being reinforced.

Positive reinforcement involves adding a pleasant stimulus to increase a behavior. While feeling better after taking medication is a positive outcome, the principle at play here is the removal of discomfort, which is characteristic of negative reinforcement rather than positive reinforcement.