Apparently, people develop phobias more readily to such objects as spiders and the dark than they do to such objects as computers and radios. This observation supports the idea of:

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The observation that people develop phobias more readily to certain objects such as spiders and the dark than to others such as computers and radios supports the idea of preparedness. Preparedness is the concept that evolution has prepared humans to be more easily conditioned to fear stimuli that were historically more threatening to our survival, such as spiders and darkness. In contrast, modern technologies like computers and radios are not inherently threatening to our survival and therefore do not elicit fear responses as readily.

Apparently, People Develop Phobias More Readily to Such Objects as Spiders