Operant conditioning (SACE Stage 2 Psychology)

What this dot point is asking

You need to explain how consequences shape voluntary behaviour, define reinforcement and punishment, and describe schedules of reinforcement, using the key researchers. This is a core external-exam topic.

The basic principle

Operant conditioning concerns voluntary behaviour that operates on the environment to produce consequences. Edward Thorndike's law of effect stated that behaviours followed by satisfying consequences are more likely to recur, and those followed by unpleasant consequences less likely.

B. F. Skinner developed this using the operant chamber (Skinner box), in which animals learned to press a lever for food. He distinguished reinforcement from punishment.

Reinforcement and punishment

Reinforcement increases behaviour; punishment decreases it. Each can be positive (adding something) or negative (removing something):

• Positive reinforcement - adding a pleasant consequence (praise, food) to increase a behaviour.
• Negative reinforcement - removing an unpleasant stimulus (turning off a loud alarm) to increase a behaviour.
• Positive punishment - adding an unpleasant consequence (a fine) to decrease a behaviour.
• Negative punishment - removing a pleasant stimulus (taking away phone privileges) to decrease a behaviour.

Shaping and primary versus secondary reinforcers

• Shaping - reinforcing successive approximations to a target behaviour to build complex behaviours step by step.
• Primary reinforcers satisfy biological needs (food, water); secondary (conditioned) reinforcers gain their power through association (money, tokens, grades).

Schedules of reinforcement

How often reinforcement is given affects how strongly and persistently behaviour is learned.

• Continuous reinforcement - every response is reinforced. Fast learning but rapid extinction.
• Fixed ratio - reinforcement after a set number of responses (every 5th lever press).
• Variable ratio - reinforcement after an unpredictable number of responses. Produces the highest, most extinction-resistant response rate (the basis of gambling).
• Fixed interval - reinforcement for the first response after a set time.
• Variable interval - reinforcement after unpredictable time periods, producing steady responding.

Why it matters

Operant conditioning underpins behaviour management, token economies, education, animal training and habit formation. Variable-ratio schedules explain why gambling and some app designs are so persistent.

Psychologists generally regard reinforcement as more effective than punishment for shaping behaviour, and evaluating why is worth marks. Punishment only suppresses a behaviour without teaching what to do instead, its effect often fades once the punisher is absent, and it can produce fear, aggression or avoidance of the punisher rather than the behaviour. Reinforcing a desirable alternative behaviour gives clearer, more durable learning. Timing also matters: consequences that follow immediately and consistently shape behaviour far more effectively than delayed or inconsistent ones, which is why real-world attempts to change behaviour often fail when the consequence is distant from the action.