Difference between Mentalism and Behaviorism

What is the difference between Mentalism and Behaviorism?

Mentalism as a noun is the doctrine that physical reality exists only because of the mind's awareness while Behaviorism as a noun is an approach to psychology focusing on behavior, denying any independent significance for mind and assuming that behavior is determined by the environment

We hope you now know whether to use Mentalism or Behaviorism in your sentence.