Little Albert Experiment

In 1920, John B. Watson and Rosalie Rayner conditioned an 11-month-old infant ('Little Albert') to fear a white rat by repeatedly pairing the rat with a loud noise. The fear generalized to rabbits, dogs, fur coats and even a Santa Claus mask.

A neutral stimulus (the rat) becomes associated with an unconditioned stimulus (the loud noise) that already triggers fear. After repeated pairings, the neutral stimulus alone triggers the fear response — a conditioned emotional response that can generalize to similar stimuli.

The study deliberately created fear in an infant who could not consent, and the fear was never removed. The child left the study before fear extinction could occur. It became a powerful example of research ethics violations and helped shape modern ethical guidelines.

It is a re-enactment inspired by the original study: the pairing process and generalization stimuli follow its outline. It is not a replication — no real infant, rat, or loud noise is involved, and nothing here can create real fear.

It has serious methodological limits. Baseline fear was assessed only informally, and Albert was reportedly selected partly because he seemed emotionally stable. It was a single-subject study with no control group, so no causal strength can be claimed. Albert's exact identity, and why and when he left the study, remain disputed by historians — he was withdrawn before the fear could be removed. Finally, deliberately inducing fear in an infant could never be approved or replicated under modern research ethics. Treat the study as a historical milestone, not a model of sound evidence.