Answer:
Unconditioned stimulus.
Explanation:
Unconditioned stimulus is one that results in a reflexive response. The response is natural, unconditional, and automatic. For example if one smells a food he likes (unconditioned stimulus) the person' s response is to become hungry.
In contrast conditioned stimulus is learners and voluntary.
The actor has had two of his movies fail at the box office so his appearance on the commercial will produce a unconditioned response from the audience that is not favorable. He will have to wait till there is a good impression about him.
