The operational definition of our IV is central in experimental research. How we set up the laboratory and the experimental manipulation is critical to the success of our experiment. Many experiments use music to induce a positive or negative mood. Energizing music such as waltzes and mazurkas or calming music such as sonatas are often used for the happy or positive condition. Complex music with many changes in tempo and tone (e.g., Wagner) or atonal music (e.g., Glass) are often used to induce negative moods. Typically, classical music is used.
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