we also find that habituation is found in our emotional responses, called the opponent-process theory, proposed by researchers richard solomon and john corbit (1974). it is known that responses by the subject tends to change by repetitively presenting certain stimuli. but concerning the opponent-process theory, some emotional reactions to the stimuli weaken (decrease) while others reactions are strengthened (increase). take for example, that is the end of the semester at your university. you have been worried about your grade for the entire semester and you need to make an a on the final in order to pass the course. you study efficiently for the test and after taking it, you feel that you will receive a very high grade. but once you check the gradebook, you see that you did not get an a on your exam. instead you received a c+. now you are distraught and know that there is no other way to pass the course for the semester. after a few minutes you begin to calm down and by the next hour you are back to your normal emotional state. this is an example of an emotional response explained by the opponent-process theory. it begins with an outside stimulus provoking an emotional reaction that increases rapidly until it is at its most intense (presumably after you learned that you did not receive a high letter grade). gradually, your emotional state declines to a level lower than normal and eventually returns to neutral. this pattern coincides with two internal processes referred to as the a-process and b-process. the a-process, or "affective" response to a stimulus, is the initial emotional response one has and can be pleasant or unpleasant. the b-process is the after reaction and has a lower intensity than the a-process. the a-process is very fast-acting and ends as soon as the stimulus ends or is removed. unlike the a-process, b-process is much slower in returning to baseline. concerning the definition of the opponent process theory—repeated presentations present habituation—the a-process does not necessarily change. it is the b-process that is strengthened instead and rises more quickly to reach the highest intensity, and much slower in attempting to return to baseline after the stimulus is removed. to sum it all up, with the opponent-process theory, repeated presentations of the same stimulus will result in habituation, where subjects show little to no reaction. it is the after-reaction that is much larger and prolonged, than if an initial reaction to a stimulus occurred.