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Many experiments have been done to find out how the brain interprets stimuli and how animals develop fear responses. The emotion, fear, has been hard-wired into almost every individual, due to its vital role in the survival of the individual. Researchers have found that fear is established unconsciously and that the amygdala is involved with fear conditioning. By understanding how fear is developed within individuals, it may be possible to treat human mental disorders such as anxiety, phobia, and posttraumatic stress disorder.