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When Little Albert was 9 months old, he was used in an experiment to test the classical conditioning theory with phobias (with his mother present). His reactions to various stimuli were tested.
One of them being the sound of a hammer striking a 4 ft. steel bar just behind his head which frightened him. With classical conditioning, the sound of the hammer hitting the bar (UCS) produces fear (UCR).
The other stimuli (a white rat, a rabbit, a dog, a monkey, masks with&without hair, cotton wool, burning newspapers) were the NS because they did not produce fear, NR.
When Albert was 11 months, the white rat & the sound were presented together (NS+UCS): as Albert would reach out to stroke the animal, Watson would cause the sound (hit the bar with a hammer). NS+UCS=UCR
This occurred multiple times, then the rat (CS) caused Albert fear (CR). Watson&Rayner had succeeded in trying to produce a fear of rates in a baby. Also, the CR also occurred with the rabbit, the dog, a fur coat, cotton wool, Watson's hair and a Santa Claus mask.
But it didn't generalize to Albert's building blocks, or to the hair of the 2 observers (so Albert was showing discrimination). 5 days after conditioning, the CR produced by the rat persisted. After 10 days, it was was still present to even 1 month later.
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