Human beings may have evolved to be more easily conditioned to fear some stimuli than others. This is Seligman's notion of

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Seligman's concept of preparedness suggests that humans and animals are biologically prepared to learn some associations more easily than others. For example, we may be more easily conditioned to fear snakes or spiders than neutral stimuli such as a rock or tree. This evolutionary preparedness for certain fears may have helped our ancestors survive in dangerous environments.

Human Beings May Have Evolved to Be More Easily Conditioned