Final answer:
A self-concept stressor is an event or situation that is perceived as overwhelming or threatening to one's well-being, affecting their self-concept. Individual differences in perception and reaction to stressors exist based on personal appraisals.
Step-by-step explanation:
A self-concept stressor is defined as an event or situation that is perceived as overwhelming or threatening to one's well-being, thereby affecting their self-concept. It is important to note that different individuals may perceive and react to stressors differently based on their own appraisal of the situation. For example, a student who has studied diligently all semester may experience less stress during final exams week compared to a student who is unprepared. Therefore, self-concept stressors are influenced by personal judgments and interpretations of events.