hyllis and Fred, two medical students who lived together, had to study every day. They both liked to relax by watching TV. Fred watched baseball, football, basketball, and other ball games broadcast on cable channels. Phyllis watched old movies on cable. The problem started to emerge as Phyllis spent time watching movies instead of studying. Her work was suffering, but she continued to watch the old movies and convinced herself that she would catch up with her studying later. On the other hand, Fred watched his ball games only after he had his work done. Phyllis finally realized she had a problem and decided that one way to help her watch TV less often, and therefore study more often, would be to discontinue cable. If she got rid of cable, she would be eliminating the antecedent (movies on cable) for the problem behavior, so that the problem behavior would be less likely to occur. What is the problem with the antecedent manipulation in this case?