In an experiment studying classical conditioning, a tone sounds and 5 seconds later a mild skin shock is delivered to a participant. the skin shock results in a stress response consisting of a temporary increase in heart rate. this process is repeated once every 5 minutes. after a number of trials, the participant demonstrates an elevated heart rate when the tone sounds and before the shock is ctually delivered. within the context of this example, what is th o the increase in heart rate to either the shock or the tone 0伍eoscillating increases and decreases in heartrate the increase in heart rate after the shock o the increase in heart rate after the tone but before the shock