By the second decade of the twentieth century, the scientific Zeitgeist was shifting away from the less objective older sciences and toward the more objective science of behaviorism. The new science quickly grew popularity among the younger scientists. College students studying psychology and other sciences yearned for a chance to work with Watson. However, the popularity of behaviorism did not last very long. The behaviorist movement ultimately fell into the background as a more cognitive approach began to emerge.

The most important antecedent of behaviorism was animal psychology. Watson state

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