Zachie is the behaver. Dad tells Zachie it’s time to get in…

Zachie is the behaver. Dad tells Zachie it’s time to get in the bath. Night after night, Zachie refuses to take a bath. One day, his Dad has an idea. He tells Zachie, “No big deal, you don’t have to. Baths are for big kids anyway.” Zachie changes his mind and gets in the bath. Now, whenever it’s time for Zache’s bath, before they even approach the bathroom, his Dad says, “Baths are for big kids” and Zachie gets in the bath. What behavioral process explains Zachie’s behavior of getting in the bath after hearing his Dad say they’re for big kids?