Behaviourist Approach: Classical Conditioning & Pavlov's Research (AQA A-Level Psychology): Revision Notes

Behaviourist Approach: Classical Conditioning & Pavlov's Research

The behaviourist approach

The behaviourist approach represents a shift in understanding human behaviour, focusing on how environmental experiences shape our actions rather than internal mental processes. This approach emerged from the belief that psychology should study only observable, measurable behaviours.

Core assumptions of behaviourism

The behaviourist approach rests on several key principles:

• Behaviour is learned through experience - All behaviours are acquired through interactions with the environment rather than being innate
• Only observable behaviour can be studied scientifically - Internal thoughts and feelings cannot be measured objectively, so behaviourists focus solely on what can be observed and recorded
• Animal and human learning follow the same principles - The basic mechanisms of learning (classical and operant conditioning) apply across species
• Humans begin as blank slates - There is no genetic influence on behaviour; individuals are shaped entirely by their environmental experiences

Classical conditioning

Classical conditioning is a learning process where an organism learns to associate a neutral stimulus with a naturally occurring stimulus, eventually producing the same response to both stimuli.

The conditioning process

Classical conditioning involves several key components working together:

• Unconditioned stimulus (UCS) - A stimulus that naturally triggers a response (e.g., food)
• Unconditioned response (UCR) - The natural response to the UCS (e.g., salivation when seeing food)
• Neutral stimulus (NS) - A stimulus that initially produces no particular response (e.g., a bell)
• Conditioned stimulus (CS) - The previously neutral stimulus that now triggers a response after conditioning (e.g., the bell after training)
• Conditioned response (CR) - The learned response to the conditioned stimulus (e.g., salivating when hearing the bell)

The conditioning process occurs in three stages:

1. Before conditioning: The UCS naturally produces the UCR, while the NS produces no relevant response.
2. During conditioning: The NS is presented alongside the UCS repeatedly, and the organism continues to show the UCR.
3. After conditioning: The previously neutral stimulus (now CS) alone can trigger the response (now CR).

Classical conditioning can explain many everyday behaviours. For instance, if someone consistently feels happy while listening to a particular song during enjoyable times, they may eventually feel happy whenever they hear that song, even in different circumstances. Similarly, classical conditioning can explain how phobias develop through negative associations between objects or situations and fear responses.

Pavlov's research

Ivan Pavlov (1849-1936) was a Russian physiologist who first systematically documented classical conditioning. While originally studying digestion in dogs, Pavlov made observations that would revolutionise our understanding of learning.

The original experiment

Participants: Laboratory dogs

Aim: To investigate the digestive processes in dogs, particularly salivation responses

Procedure: Pavlov initially observed that dogs would naturally salivate when presented with food. He noticed that over time, the dogs began to salivate merely upon hearing footsteps of the assistant bringing food, before the food was even visible. This observation led him to design a controlled experiment where he rang a bell each time food was presented to the dogs.

Findings: After repeated pairings of the bell with food presentation, Pavlov discovered that the dogs would salivate in response to the bell alone, even when no food was present. The bell had become a conditioned stimulus, and salivation in response to it had become a conditioned response.

Evaluation: Strengths

• Scientific rigour - Pavlov used controlled laboratory conditions and objective measurements, establishing classical conditioning as a legitimate scientific phenomenon
• Reproducible results - The findings have been replicated countless times across different species and contexts
• Practical applications - The principles have been successfully applied in various fields including education, therapy, and behavioural modification
• Clear methodology - The experimental procedure was straightforward and could be easily understood and replicated

Evaluation: Weaknesses

• Limited ecological validity - Laboratory conditions with dogs may not fully represent how learning occurs in natural human environments
• Reductionist approach - Focuses only on stimulus-response relationships while ignoring cognitive factors that may influence learning
• Ethical concerns - The experiments involved restraining animals and controlling their access to food
• Species differences - Findings from dogs may not directly translate to human learning processes

Additional discoveries from Pavlov's research

Pavlov's work revealed several important principles that extend beyond basic classical conditioning:

Stimulus generalisation

Stimulus generalisation occurs when an organism responds to stimuli that are similar to the original conditioned stimulus. Pavlov found that dogs would salivate not only to the specific bell sound used in training but also to bells with similar pitch and tone. This principle explains why someone who develops a fear of one type of dog might also show fear responses to other similar-looking dogs.

Stimulus discrimination

Stimulus discrimination represents the opposite process - when an organism learns to distinguish between similar stimuli and responds only to the specific conditioned stimulus. There comes a point where stimuli become too different from the original to trigger the conditioned response. For example, a dog might learn to respond only to a specific bell tone and not to significantly different sounds.

Time contiguity (temporal contiguity)

Pavlov discovered that timing is critical for successful conditioning. The neutral stimulus and unconditioned stimulus must be presented close together in time - ideally simultaneously or with the neutral stimulus slightly preceding the unconditioned stimulus. If too much time passes between presentations, the association will not be formed effectively.