4.1.3 Operant conditioning, Hull and programmed learning

Explained

1. The four consequences. "Positive" means something is added, "negative" means something is taken away. Reinforcement always increases a behaviour; punishment always decreases it.

• Negative reinforcement is not punishment. A pupil finishes work to escape the teacher's reminders; the work rate goes up.
• Primary reinforcers satisfy biological needs (food, water). Secondary (conditioned) reinforcers gain value by pairing (praise, grades, stars). Generalised reinforcers buy many things (money, tokens); a token economy in a hostel or class uses them.
• Premack principle (David Premack, "Grandma's rule"): a preferred activity reinforces a less preferred one: "finish the sums, then play".
• Skinner preferred reinforcement to punishment: punishment only suppresses behaviour for a while, causes fear and does not teach the right response.
• Problems of punishment: the behaviour is suppressed, not unlearnt; it breeds fear and aggression (even fear of school); it shows what not to do, not what to do. If used at all, it works best when immediate, consistent, moderate from the start, and paired with a rewarded alternative.

2. Schedules of reinforcement.

• Continuous reinforcement (CRF): every correct response is rewarded. Fastest for learning a new behaviour, but extinction is also fast.
• Partial (intermittent) reinforcement: only some responses are rewarded. Learning is slower but more resistant to extinction (partial reinforcement effect).

3. Other operant processes.

• Shaping: reward closer and closer approximations (teaching a child to write a letter, a pigeon to turn a circle).
• Chaining: linking simple responses into a sequence, each step reinforcing the one before.
• Extinction: withholding the reinforcer weakens the response; spontaneous recovery may follow after rest.
• Discriminative stimulus (SD, "S-dee"): a cue showing when a response will be reinforced (the bell for answering, a green light).
• Generalisation and discrimination: responding to similar cues, and learning to respond only to the right one.
• Superstitious behaviour: an accidental link between a response and a reward (Skinner's pigeons, 1948).

4. Classical vs operant conditioning (APPSC 2025 asked the main difference).

5. Operant conditioning in the classroom.

• Reward right answers immediately; praise effort, not only results.
• Break skills into small steps and reinforce each (shaping).
• Use intermittent praise once a habit is formed so that it lasts.
• Ignore minor attention-seeking (extinction) instead of scolding it.
• Behaviour modification for discipline in classes and hostels: clear rules, token rewards, time-out. It changes behaviour by planned reinforcement and extinction, so it rests mainly on operant conditioning.
• Token economy: tokens (stars, points) earned for target behaviour are later exchanged for rewards; used with children with intellectual disability, in de-addiction and in rehabilitation centres.
• Children with intellectual disability learn self-care (dressing, eating, toilet use) in small steps, each reinforced.
• Applied behaviour analysis (ABA) grew out of classical conditioning, operant conditioning and social learning theory.
• Programmed learning, teaching machines and computer-assisted instruction (CAI) grew from it.

6. Hull's drive-reduction theory.

• Chain: need (lack of food) → drive (hunger, an inner push) → response → goal reached → drive is reduced → that S–R bond is reinforced.
• Primary drives are inborn (hunger, thirst, pain avoidance); secondary drives are learnt (fear, desire for money or approval).
• Habit strength (sHr) grows with the number of reinforced trials. Behaviour happens when reaction potential sEr = sHr × D is high enough: a strong habit needs a drive to show itself.
• Reactive inhibition: fatigue from repeating a response, which rest removes; supports spaced (distributed) practice.
• Goal gradient: responses near the goal are learnt faster (a rat runs faster as it nears the food).
• Hull is a neo-behaviourist: he used intervening variables (drive, habit) between S and R and stated his theory as postulates with mathematical equations.
• Classroom use: link lessons to pupils' needs; reward soon after the response; give practice with rest pauses; build habits through repetition.

7. Programmed instruction (PI). Self-instructional material in which content is broken into small frames; the learner responds to each and is told at once whether the response was right.

Basic principles: small steps, active responding, immediate feedback (knowledge of results acts as reinforcement), self-pacing, logical sequence, student testing (the programme is revised until learners succeed).

Kinds of frames: introductory (teaching) frames, practice frames, review frames and test (criterion) frames. Prompts are cues given in a frame and slowly removed (fading). RULEG (rule, then example: a deductive order) and EGRUL (example, then rule: an inductive order) are ways of ordering a frame sequence (Evans, Homme and Glaser, 1962).

Steps in preparing a programme: (1) choose the unit, (2) write the objectives in behavioural terms, (3) analyse the content, (4) find the learners' entry behaviour, (5) write the frames, (6) try out (individual, small group, field try-out), (7) revise and validate against error rate and gains.

Merits: self-paced, individualised, immediate feedback (knowledge of results keeps the learner motivated), the learner is active, useful in distance and remedial teaching; a failed programme is revised, the learner is not blamed. Limits: dull for bright pupils (linear), costly to prepare, little room for discussion, suits factual content more than creativity or values.