Maddie wakes up with a slight toothache on the day of an important job interview. As the stressful event approaches, her anxiety increases and so does her perception of the pain from her tooth. When the interview is over, Maddie is elated because she feels that it has gone well and, to her surprise, she feels hardly any pain from her tooth. Maddie's experience is BEST explained by the _____ and the contribution of her psychological and emotional state.