Classical Conditioning: Principles and Applications (Chapter 6 Study Notes)

Classical Conditioning

Introduction to Learning

Learning is a fundamental concept in psychology, referring to any relatively durable change in behaviour or knowledge due to experience. This process underlies many psychological phenomena, including phobias, superstitions, and conditioned responses.

• Learning: Any relatively permanent change in behaviour or knowledge resulting from experience.

• Phobias: Irrational fears of specific objects or situations, often acquired through learning.

• Superstitions: Behaviours that are maintained by positive reinforcement, such as winning a game and repeating the same actions for luck.

• Conditioning: The process of forming associations between events in the environment.

Classical Conditioning: Definition and Historical Background

Classical conditioning is a type of associative learning where a neutral stimulus acquires the ability to evoke a response originally elicited by another stimulus. This process was first systematically studied by Ivan Pavlov, a Russian physiologist.

• Classical Conditioning: Learning in which a stimulus comes to elicit a response that it did not previously evoke.

• Ivan Pavlov (1849-1936):

  • Russian physiologist who studied the role of saliva in digestion in dogs.

  • Discovered "psychic reflexes"—responses triggered by stimuli associated with food.

  • Developed the concept of Pavlovian conditioning.

Classical Conditioning Apparatus

Pavlov's experiments used a controlled apparatus to measure salivation in dogs. A neutral stimulus (such as a tone) was paired with an unconditioned stimulus (meat powder), and the dog's salivation was measured as an indicator of learning.

• Unconditioned stimulus (UCS): A stimulus that naturally and automatically triggers a response (e.g., meat powder).

• Unconditioned response (UCR): The unlearned, naturally occurring response to the UCS (e.g., salivation).

• Conditioned stimulus (CS): A previously neutral stimulus that, after association with the UCS, triggers a conditioned response (e.g., tone).

• Conditioned response (CR): The learned response to the previously neutral stimulus (e.g., salivation to tone).

Terminology and Procedures in Classical Conditioning

Several key terms and procedures are essential for understanding classical conditioning:

• Trial: Each pairing of the UCS and CS.

• Acquisition: The initial stage of learning when a response is first established.

• Stimulus contiguity: The occurrence of stimuli together in time and space, which facilitates association.

• Evaluative conditioning: The process by which likes and dislikes are acquired through association with positive or negative stimuli.

Processes in Classical Conditioning

Classical conditioning involves several processes that affect the strength and persistence of learned associations:

• Extinction: The gradual weakening and disappearance of a conditioned response when the CS is repeatedly presented without the UCS.

• Spontaneous recovery: The reappearance of an extinguished response after a period of non-exposure to the CS.

• Renewal effect: The recovery of a conditioned response when the organism is returned to the original learning environment.

• Stimulus generalization: The tendency for a conditioned response to be elicited by stimuli similar to the CS (e.g., Little Albert experiment).

• Stimulus discrimination: The ability to distinguish between the CS and other similar stimuli, resulting in a weaker response to non-CS stimuli.

• Higher-order conditioning: The process by which a CS can function as a UCS in further conditioning.

Cognition and Classical Conditioning

Cognitive factors play a significant role in classical conditioning. According to Rescorla (1978/1980), the predictability and reliability of signals influence the strength of conditioning.

• Expectations: Organisms learn to expect the UCS when presented with a reliable CS.

• Signal reliability: A CS that consistently predicts the UCS elicits a stronger conditioned response than a CS that is less reliable.

• Example: Rats show stronger conditioning when a tone (CS) is always paired with a shock (UCS) compared to when the pairing is inconsistent.

Evolutionary and Biological Effects on Conditioning

Biological predispositions and evolutionary factors influence the ease and nature of conditioning. Some associations are learned more readily due to their adaptive significance.

• Conditioned taste aversion: The development of an aversion to a taste after it is paired with illness, even with a long delay between CS and UCS (e.g., Seligman's sauce béarnaise syndrome).

• Preparedness: Species-specific predispositions to learn certain associations more easily (e.g., fear of snakes or the dark).

• Evolutionary learning: Natural selection favours organisms that quickly learn to avoid harmful stimuli.

Summary Table: Key Terms in Classical Conditioning

Term	Definition	Example
Unconditioned Stimulus (UCS)	Stimulus that naturally evokes a response	Meat powder
Unconditioned Response (UCR)	Natural, unlearned reaction to UCS	Salivation
Conditioned Stimulus (CS)	Previously neutral stimulus that elicits CR after pairing	Tone
Conditioned Response (CR)	Learned reaction to CS due to conditioning	Salivation to tone

Key Equations and Concepts

• Acquisition Curve: The rate of learning can be represented as a function of trials: $\text{CR Strength} = f(\text{Number of CS-UCS pairings})$

• Extinction: The decrease in CR strength over time when CS is presented without UCS: $\text{CR Strength}_{\text{after extinction}} < \text{CR Strength}_{\text{acquisition}}$

Additional info: These notes expand on the brief points in the slides and handwritten notes, providing definitions, examples, and academic context for each concept. The summary table and equations are inferred to support exam preparation and conceptual understanding.