Facial Feedback Hypothesis: This is the idea that facial expressions can actually influence our emotional experiences. For example, smiling can make us feel happier.
Cognitive Dissonance: This refers to the uncomfortable feeling of having conflicting thoughts or beliefs. People often try to reduce cognitive dissonance by changing their attitudes or justifying their behavior.
Overjustification Effect: This occurs when external rewards (such as money) decrease a person's intrinsic motivation to perform a task they already enjoy doing.