Understanding Motivation and Drive Theories in Psychology
Intrinsic and extrinsic motivation represent two fundamental forces that drive human behavior. While intrinsic motivation comes from within - like personal satisfaction or enjoyment, extrinsic motivation stems from external rewards or consequences like money, praise, or avoiding punishment.
Definition: The overjustification effect occurs when excessive external rewards decrease a person's intrinsic motivation to perform an activity they previously enjoyed.
Drive reduction theory, developed by Clark Hull in 1943, explains how biological needs create motivational states. This theory suggests that organisms are driven to maintain homeostasis - a balanced internal state. When this balance is disrupted, discomfort creates a drive to take action. For example, hunger motivates eating behavior, while thirst drives drinking behavior.
Example: A student studying for an exam might be motivated both intrinsically (desire to master the material) and extrinsically (wanting to earn a good grade). However, if parents offer excessive monetary rewards for good grades, the student's intrinsic interest in learning might decrease due to the overjustification effect.
The relationship between motivation and behavior is further explained through secondary drives, which are learned motivations that satisfy primary biological needs. In modern psychology, this helps explain complex human behaviors like working for money (secondary drive) to obtain food and shelter (primary drives).











