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 The Little Albert Experiment: How Children Acquire Fears, and Whether Fear Can Be Learned

In short
In 1920, behaviorism's founder John B. Watson and his assistant Rosalie Rayner showed that fear could be produced in an infant through classical conditioning. It remains one of the most famous — and most ethically controversial — experiments in psychology.

How the experiment worked
The participant was Albert B., the son of a hospital employee, described as calm and healthy. At 9 months he was shown a white rat, a rabbit, a dog, a monkey, masks and cotton wool and showed no fear. A sudden loud noise — a hammer striking a steel bar behind him — did make him startle and cry.
At 11 months, Albert was shown the white rat, and as he reached for it the bar was struck. After seven pairings of rat and noise, he was tested with the rat alone.

Results
  • At the sight of the rat, Albert cried and crawled away — with no noise at all.
  • Within days, the fear transferred to similar objects: a rabbit, a dog, a fur coat, cotton wool and a Santa Claus mask with a white beard (generalization).
  • Fear responses partly persisted a month later, though weaker.
  • The fear was never removed: Albert left the hospital before any deconditioning.
Conclusions and significance for developmental psychology
Watson argued that many of children's emotional reactions and fears are learned through experience rather than innate. The work laid the foundations for behavioral approaches to anxiety. In 1924, Mary Cover Jones showed the reverse: a boy named Peter's fear of a rabbit was gradually eliminated — a forerunner of systematic desensitization and exposure therapy. The study also became the classic case of unethical research; it could not be done today.
What it means for parents
Children's fears often start after an unpleasant experience and spread to similar situations. The good news: they can be reduced the same way — through gentle, step-by-step contact with what frightens the child in a safe setting, without force or mockery.
What it means for professionals
The study is the historical basis for exposure-based treatment of childhood fears and phobias; modern models also consider biological "preparedness" for certain fears (Öhman & Mineka, 2001). In training, it remains a key case for discussing informed consent and participant protection.

References
  • Harris, B. (1979). Whatever happened to Little Albert? American Psychologist, 34(2), 151–160. https://doi.org/10.1037/0003-066X.34.2.151
  • Jones, M. C. (1924). A laboratory study of fear: The case of Peter. The Pedagogical Seminary, 31(4), 308–315. https://doi.org/10.1080/08856559.1924.9944851
  • Öhman, A., & Mineka, S. (2001). Fears, phobias, and preparedness: Toward an evolved module of fear and fear learning. Psychological Review, 108(3), 483–522. https://doi.org/10.1037/0033-295X.108.3.483
  • Watson, J. B., & Rayner, R. (1920). Conditioned emotional reactions. Journal of Experimental Psychology, 3(1), 1–14. https://doi.org/10.1037/h0069608
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