When instinct theory was incorporated into the new scientific psychology of the late nineteenth century, it was already centuries old. In its earliest form, instinct theory specified that a creature's essential nature was already established at birth and that its actions would largely be directed by that nature. A modern restatement of this notion would be that, at birth, creatures are already programmed and that they must operate according to their programs.
Charles Darwin's theory of evolution through natural selection, first published in 1859, led to great controversy in the late nineteenth and early twentieth centuries. It also fostered speculation that, if humans were evolved from earlier forms and were therefore more closely related to other animals than had once been believed, humans might have instincts—inherited behaviors—as other animals were observed to have. William McDougall was one of the main early instinct theorists; he suggested a list of human instincts in 1908 that included such varied behaviors as repulsion, curiosity, self-abasement, and gregariousness. Many researchers came up with their own lists of human instincts; by the 1920's, more than two thousand had been suggested.
A computer program can be printed out and studied, but an instinct in the original sense cannot so easily be made explicit. At best, it can be inferred from the behavior of an animal or person after other explanations for that behavior have been discounted. At worst, it is simply assumed from observing behavior. That a person has, for example, an instinct of argumentativeness could be assumed from the person's arguing; arguing is then "explained" by declaring that it comes from an instinct of argumentativeness. Such circular reasoning is unacceptable in scientific analyses, but it is very common in some early scientific (and many modern, popular) discussions of instinct.
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