Classical/Operant Conditioning
Classical and Operant Conditioning
Classical Conditioning
Classical conditioning is a form of learning in which a neutral stimulus comes to produce a reflexive response after repeated pairing with a stimulus that naturally produces that response. The process was first described by Ivan Pavlov (1897) through his experiments with dogs. Pavlov observed that dogs salivated at the sight of the technician who fed them, not just when food was presented. He proceeded to pair a bell (neutral stimulus) with the presentation of food (unconditioned stimulus). After repeated pairings, the bell alone (now the conditioned stimulus) produced salivation (conditioned response).
Core elements: Unconditioned Stimulus (UCS) naturally triggers a response (e.g., food causes salivation); Unconditioned Response (UCR) is the natural, unlearned response (e.g., salivation to food); Conditioned Stimulus (CS) is a previously neutral stimulus that now triggers the response after learning (e.g., bell); Conditioned Response (CR) is the learned response to the CS (e.g., salivation to bell)
The Little Albert Study: Watson and Rayner (1920): John Watson and Rosalie Rayner demonstrated classical conditioning of fear in humans in their controversial study with an infant known as Little Albert. Albert was first shown a white rat; he showed no fear. A loud noise (UCS) was then struck behind his head whenever he reached for the rat (CS). After repeated pairings, Albert began to cry and attempt to move away from the rat even without the noise. This conditioned fear also generalised to other similar stimuli including a rabbit, dog, and a Santa Claus mask, demonstrating stimulus generalisation. This study showed that emotional responses could be conditioned, which has implications for understanding how phobias develop. However, it raises serious ethical concerns -- the infant could not give informed consent, was not debriefed, and the conditioned fear may not have been extinguished.
Operant Conditioning
Operant conditioning, developed by B.F. Skinner building on Edward Thorndike's Law of Effect (1898), explains how voluntary behaviours are shaped by their consequences. Unlike classical conditioning, which involves reflexive responses, operant conditioning involves the organism actively operating on its environment. Behaviours followed by satisfying consequences are more likely to be repeated; behaviours followed by unpleasant consequences are less likely to be repeated.
Skinner identified four core mechanisms: Positive reinforcement (adding pleasant stimulus increases behaviour); Negative reinforcement (removing unpleasant stimulus increases behaviour); Positive punishment (adding unpleasant stimulus decreases behaviour); Negative punishment (removing pleasant stimulus decreases behaviour).
Skinner tested these principles using his famous Skinner Box -- a chamber in which rats or pigeons could press levers or peck at discs to receive food pellets. By controlling the schedule of reinforcement, Skinner discovered that different reinforcement schedules produce different patterns of behaviour. Variable ratio schedules (reward given after an unpredictable number of responses) produce the highest and most persistent rates of response, a finding that explains the compulsive nature of gambling.
Evaluation: Both forms of conditioning are well-supported by controlled laboratory evidence and have practical applications in behaviour therapy, addiction treatment, education, and parenting. However, both theories adopt a reductionist approach that ignores mental processes. Conditioning also cannot easily account for behaviours that require insight, creativity, or moral reasoning. Pavlov's and Skinner's experiments used animals, raising questions about whether findings transfer fully to human behaviour. Additionally, ethical concerns attach to both the Little Albert study and to animal experiments using aversive stimuli.