Joe's favorite food is spaghetti. his mom always makes it for him on friday night, but she does not like the way he slurps the spaghetti into his mouth. one friday night, she attempts to change joe's eating pattern. at dinner, she picks up her spoon and fork and begins to roll the spaghetti. david, joe's brother, used his fork and spoon as well. susan, joe's sister, also used her fork and spoon to roll her spaghetti. at first, joe slurps the spaghetti into his mouth, but after a few minutes, he begins to use his fork and spoon as well. in this example, joe is learning behavior through