Thorndike's Puzzle Boxes And The Origins Of The Experimental Analysis Of Behavior.

Sturmey (1999) tells the story of Edward Thorndike’s 1898 dissertation. Thorndike built small wooden boxes. He placed cats inside and timed how long it took them to escape. Each cat learned to press a lever or pull a string to open the door.

The paper calls these puzzle-box experiments the birth of the experimental analysis of behavior. Thorndike recorded every latency. He watched the cats get faster across trials. This was the first time learning was measured in minutes and seconds, not stories.

The cats did not think through the problem. They simply repeated actions that worked. Thorndike called this the law of effect: responses that produce satisfying outcomes become more likely.

That single idea grew into modern operant conditioning. The paper argues that every reinforcement study you run today started inside those wooden boxes.

Semb (1974) shows the same shaping process in pigeons. Tiny head turns toward a key were reinforced first, then closer pecks, then full key pecks. Both papers show that big behaviors are built from small reinforced steps.

Rey et al. (2020) add a twist. Their DRO study says reinforcement can also strengthen other behavior by accident. Thorndike saw only the target escape response; Rey et al. remind us that unseen compatible responses may also grow.

STAATROSS et al. (1962) move the idea into a classroom. Preschoolers learned to read words faster when tokens and snacks followed correct responses. The puzzle-box principle works across cats, birds, and children.

When you break a skill into small steps and reinforce each success, you are using Thorndike’s law of effect. Tell your team the story of the cats. It shows why data sheets, timing, and immediate reinforcement are not optional—they are the roots of our science.