Edward Thorndike
Development of law of effect

Thorndike's research focused on instrumental learning, which means that learning is developed from the organism doing something. For example, he placed a cat inside a wooden box. The cat would use various methods while trying to get out, but nothing would work until it hit the lever. Afterwards, Thorndike tried placing the cat inside the wooden box again. This time, the cat was able to hit the lever quickly and succeeded in getting out from the box.

At first, Thorndike emphasized the importance of dissatisfaction stemming from failure as equal to the reward of satisfaction with success, though in his experiments and trials on humans he came to conclude that reward is a much more effective motivator than punishment. He also emphasized that the satisfaction must come immediately after the success, or the lesson would not sink in.
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