Classical conditioning
A behavioral procedure pairing stimuli to produce automatic responses.
Classical conditioning, also called respondent or Pavlovian conditioning, is a procedure where a biologically significant stimulus—like food or a puff of air—is repeatedly paired with a neutral one, such as the sound of a triangle. The process involves an automatic, learned response that becomes linked to a specific stimulus, functioning much like a signal.
The Russian physiologist Ivan Pavlov first demonstrated this through detailed experiments with dogs, publishing his initial findings in 1903 and his major work 'Conditioned Reflexes' in 1927. While studying digestion, he noticed that the dogs salivated before being given food—for example, at the sight of the feeder or the sound of footsteps. He called this anticipatory salivation 'psychic secretion.' This type of conditioning is different from operant (or instrumental) conditioning, where the strength of a voluntary behavior is changed by reinforcement or punishment. However, classical conditioning can influence operant conditioning: classically conditioned stimuli can reinforce operant responses.
Classical conditioning is a fundamental behavioral mechanism, and researchers are beginning to understand its neural basis. Although it can be difficult to separate from other forms of associative learning—such as instrumental learning or human associative memory—several observations, especially the contingencies under which learning occurs, help distinguish them.
Along with operant conditioning, classical conditioning formed the basis of behaviorism, a school of psychology that dominated the mid-20th century and still significantly influences psychological therapy and the study of animal behavior. Its applications extend further: it can affect the body’s response to psychoactive drugs, regulate hunger, inform research on the neural basis of learning and memory, and play a role in social phenomena like the false consensus effect.
In classical conditioning, a conditioned stimulus (CS) is paired with an unconditioned stimulus (US). The CS is usually neutral (e.g., a tuning fork’s sound), while the US is biologically potent (e.g., food’s taste), and the unconditioned response (UR) is an innate reflex (e.g., salivation). After repeated pairings, the organism shows a conditioned response (CR) to the CS alone—though this can happen after just one pairing. Unlike the UR, the CR is learned through experience and is
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- Psychology, Physiology
- known_for
- Classical conditioning experiments with dogs
Lore & Background
Ivan Pavlov, the Russian physiologist, studied classical conditioning with detailed experiments on dogs and first published his findings on conditioned reflexes in 1903, with his comprehensive work 'Conditioned Reflexes' appearing in 1927. During his research on the physiology of digestion, Pavlov noticed that his dogs began to salivate before being given food—for instance, at the sight of the feeder or the sound of footsteps—rather than simply salivating in response to the meat itself. He called this anticipatory salivation 'psychic secretion.' Pavlov presented a stimulus (e.g., the sound of a metronome) and then gave the dog food; after a few repetitions, the dogs started to salivate in response to the stimulus alone. He concluded that if a particular stimulus in the dog's surroundings was present when the dog was given food, that stimulus could become associated with food and cause salivation on its own.
Reader's Guide
Classical conditioning is a basic behavioral mechanism, and its neural substrates are now beginning to be understood. Together with operant conditioning, classical conditioning became the foundation of behaviorism, a school of psychology dominant in the mid-20th century and still an important influence on psychological therapy and the study of animal behavior. Classical conditioning has been applied in other areas, such as affecting the body's response to psychoactive drugs, the regulation of hunger, research on the neural basis of learning and memory, and in certain social phenomena like the false consensus effect. Evaluative conditioning is a form of classical conditioning that concerns only a change in evaluative responses to the conditioned stimulus, such as attitude formation through pairing with positive or negative stimuli. A classic example is the 1958 experiment by Staats and Staats, where nationality names paired with positive or negative words influenced subjects' ratings of those nationalities.
Did You Know?
- Classical conditioning is also called respondent conditioning and Pavlovian conditioning.
- Ivan Pavlov published his experimental results on classical conditioning in 1897.
- A conditioned response may occur after only one pairing of the conditioned stimulus with the unconditioned stimulus.
- Evaluative conditioning refers to attitude formation or change toward an object due to that object's mere co-occurrence with another object.
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