Problem
Billy's sister, Lisa, loves to watch Dr.Phil every afternoon. Billy loves to annoy Lisa every chance he gets! After Lisa is settled on the couch and quietly watching the tv show, Billy will sit next to her and start burping. Lisa will scream to her mother, "Mom! Tell Billy to stop!!! Billy just laughs and continues to burp, burp, burp.
What is the reinforcement contingency for Billy's burping. (stimulus-response-stimulus)