After the puzzle boxes: thorndike in the 20th century.

The author walked readers through Edward Thorndike’s full career, not just his famous cat puzzle boxes.

The paper pulls from books, lectures, and later experiments that most people never cite.

It shows how Thorndike kept refining his ideas on learning, transfer, and education policy until the 1940s.

Thorndike’s later work gave us three durable tools: the law of effect, the law of exercise, and the idea that rewards strengthen bonds.

These same rules sit under every token board, sticker chart, and praise statement we use today.

He also proved that learning in one subject can boost scores in another—an early nod to generalization.

Barbash (2021) carries the torch forward, showing that Siegfried Engelmann’s Direct Instruction uses the same reward-and-practice logic Thorndike spelled out.

Morris et al. (2018) digs into Ferster’s 1950s data and finds the same durability of rewarded behavior that Thorndike called the law of effect.

Bacotti et al. (2021) looks at staff feedback timing and finds preferences shift as skills grow—exactly the kind of nuanced reward effect Thorndike said would happen.

If you know where the laws come from, you can explain them to teachers, parents, and payors in plain English.

Next time someone asks why we give a gummy after a correct response, cite Thorndike: the reward stamps the bond.

The paper also reminds us that early learning theorists cared about real classrooms, not just lab cages—so we should too.