Thorndike's Laws
Thorndike's Laws
Edward Thorndike explained learning as trial and error: the learner tries many responses, and the one that succeeds is stamped in. He gave three primary laws — readiness, exercise and effect — from his cat-in-the-puzzle-box experiments, and his theory is also called connectionism or S-R bond theory.
The experiment in one line
A hungry cat was shut in a puzzle box with fish outside. It scratched, bit and jumped at random until it happened to press the lever. On repeated trials the useless movements dropped away and the time taken fell. Learning, said Thorndike, is the strengthening of a bond between a stimulus and a successful response.
The three primary laws
| Law | Statement | Classroom meaning |
|---|---|---|
| Readiness | Learning happens when the learner is prepared to act | Do not begin division before the child is ready with multiplication |
| Exercise | A bond strengthens with practice and weakens without it | Spaced revision of tables; use it or lose it |
| Effect | Responses followed by satisfaction are stamped in; by annoyance, stamped out | Encouragement after a correct attempt makes it repeat |
The law of effect is the most important of the three and the direct ancestor of Skinner's reinforcement. Thorndike later revised it: satisfaction strengthens a bond strongly, but annoyance does not weaken it equally — punishment is the weaker tool. Note that the law of exercise has two halves, the law of use and the law of disuse.
Subsidiary laws worth knowing
- Law of multiple response — the learner varies responses until one works.
- Law of attitude or set — the learner's mental set decides what is attempted.
- Law of partial activity — the learner responds to the essential element of a situation.
- Law of associative shifting — a response can be shifted to a new stimulus.
- Law of analogy — new situations are met by responses from similar old ones.
Trial and error in Classes 1-5
- A Class 1 child learning to tie shoelaces repeats wrong loops until one holds.
- A Class 3 child solving a jigsaw puzzle tries pieces at random, then by shape.
- A Class 4 child learning to spell 'because' writes it several wrong ways before the correct form settles.
✗ Thorndike said punishment weakens a habit as strongly as reward strengthens it. | ✓ He revised the law of effect: reward is far more powerful than punishment.
संकेत: थार्नडाइक = प्रयास एवं त्रुटि (trial and error); तीन मुख्य नियम — तत्परता, अभ्यास, प्रभाव।
Thorndike is worth 1-2 questions and they are nearly always about the three primary laws. Expect an item that gives a classroom action and asks which law it illustrates: repeated practice is exercise, waiting for maturity is readiness, praise after an answer is effect. The frequent trap gives 'law of effect' where reinforcement is described and 'law of exercise' where reward is described — check whether the sentence mentions practice or consequence. Remember also that his theory is called connectionism and his subject was a cat, while Pavlov used dogs and Skinner used rats and pigeons.
Frequently asked questions
What are Thorndike's three primary laws of learning?
Readiness, exercise and effect. Readiness says the learner must be prepared, exercise says bonds strengthen through practice and fade through disuse, and effect says responses followed by satisfaction are repeated.
Why is Thorndike's theory called trial and error learning?
Because in his puzzle-box experiments the animal made many random attempts and gradually eliminated the useless ones, keeping only the response that produced success. Learning was the slow selection of the correct response.
How is the law of effect connected to Skinner's theory?
Skinner built directly on it. Where Thorndike said satisfying consequences stamp a response in, Skinner formalised this as reinforcement and worked out precise schedules by which it operates.
60-second recap
- Thorndike = trial and error learning, also called connectionism or S-R bond theory.
- Primary laws: readiness, exercise (use and disuse), effect.
- Law of effect is the strongest and leads to Skinner's reinforcement.
- Revised law: reward strengthens more than punishment weakens.
- Experiment: hungry cat in a puzzle box, time per trial falls.