Q.Distinguish between classical conditioning and operant conditioning, giving one real-life example of each.

Although classical and operant conditioning are both basic forms of conditioning and share several underlying processes (such as reinforcement, extinction, generalisation, and discrimination), they differ from one another in several fundamental ways. First, in classical conditioning, the responses involved are reflexes, automatically and involuntarily elicited by an appropriate stimulus — the stimuli that trigger them are designated the unconditioned stimulus (US) and the response they elicit is the unconditioned response (UR); because responses here are elicited automatically by a stimulus that the experimenter controls, classical conditioning is often called respondent conditioning. In operant or instrumental conditioning, by contrast, the responses are voluntary "operants," under the organism's own control rather than automatically triggered by any particular stimulus — different types of responses are conditioned under the two paradigms altogether.

Second, in classical conditioning both the conditioned stimulus (CS) and unconditioned stimulus (US) are well-defined and directly observable by the experimenter, but in operant conditioning the "CS" is not directly defined at all — at best, it can only be inferred from the situation, never directly identified the way it can be in classical conditioning.

Third, and perhaps most fundamentally, the two paradigms differ in who controls the key stimulus event. In classical conditioning, the experimenter controls the occurrence of the US — the dog does not do anything to make the food appear, it is simply presented on the experimenter's schedule, so the organism remains passive throughout the procedure. In operant conditioning, the occurrence of the reinforcer is instead controlled by the organism that is learning — the rat only receives food if and when it presses the lever itself — so the organism must be genuinely active, producing the very consequence that reinforces it, in order to be reinforced at all.

Fourth, the two forms of conditioning use somewhat different technical vocabulary for what is, in a sense, a related concept: what is called the "reinforcer" in operant conditioning is essentially termed the "US" in classical conditioning. In classical conditioning, the US actually plays two combined roles — early in the procedure it elicits the unconditioned response directly, and it simultaneously reinforces the developing association between the CS and that response, which is what allows the CS to go on eliciting the response (as a CR) on its own later. Because of these differences — reflexive versus voluntary responses, defined versus inferred CS, experimenter-controlled versus organism-controlled key stimulus, and differing technical terminology — classical and operant conditioning, though often discussed together as the two basic paradigms of conditioning, are genuinely distinct processes that explain different categories of learned behaviour.