Why do we form habits? Why are some fears so hard to shake? In the early 20th century, behaviourism became one of the first scientific approaches in psychology to answer these questions. It is suggested that much of our behaviour is learned through experience. Instead of looking inside the mind, behaviourists studied what could be seen and measured.

Although behaviourism is now considered outdated as a complete explanation of human behaviour, its ideas still shape modern therapies and health programmes.

How Behaviour is Learned

Behaviourists showed that behaviour changes depending on what happens afterwards. If an action leads to a positive outcome, we tend to repeat it. If it leads to something negative, we usually avoid it.

Simple experiments demonstrated this:

• A cat learned to escape a box more quickly when escaping led to the reward of food.
• A child developed a fear of a rat after it was paired with a loud, frightening noise.
• Dogs started salivating when they heard a bell that was always followed by food.

These studies revealed that habits, fears and cravings can be learned. More importantly, they also showed that unhelpful behaviours can be unlearned.

Everyday Applications in Health

The principles of behaviourism are still visible in health today:

• Phobia treatment: People who fear flying, spiders or injections can gradually face these fears in a safe way while practising relaxation. Over time, the fear response weakens.
• Addiction and bad habits: Cues such as the smell of cigarettes, alcohol, or even certain social situations can trigger cravings. Recognising these “triggers” is a key step in treatment programmes.
• Building healthy habits: Encouragement, praise and small rewards are used to help people stick to exercise routines, follow diets or take medication regularly. For example, fitness apps often use points and badges to keep people motivated.

These examples show how behaviourist principles continue to shape practical tools that improve health and wellbeing.

From Behaviourism to Modern Psychology

Despite its influence, behaviourism is no longer seen as a full explanation of human behaviour. It ignored thoughts, feelings, and biology, and much of the research came from animal studies. People are more complex than simple patterns of reward and punishment.

Yet behaviourism remains important because it laid the foundation for modern psychology. It proved that behaviour could be studied scientifically and inspired therapies that are widely used today. Cognitive behavioural therapy (CBT), for example, combines behavioural methods, such as exposure and reinforcement, with attention to thoughts and beliefs. Its effectiveness for treating anxiety, depression and phobias shows how behaviourism still lives on in modern health practice.

Key Insights

Behaviourism may no longer dominate psychology, but its influence is everywhere. By understanding how behaviour can be conditioned, we gain tools to break unhelpful patterns and build healthier habits.

Want more? Follow HealthPsyUK for insights into how psychology supports wellbeing, resilience, and behaviour change.

Further Reading

• Guercio, J. M. (2020). The importance of a deeper knowledge of the history and theoretical foundations of behaviorism and behavior therapy: Part 2 — 1960–1985. Examines how behaviourism evolved into cognitive-behavioural therapies. 
• Koulouvari, A.-D., et al. (2025). Applications of behavioral change theories and models in health promotion interventions: A rapid review. Shows how behavioural theories are applied in modern health promotion.