Dr. Garza removed an area of the brain of a rhesus monkey. The monkey is now extremely friendly, explores objects that he used to fear, and puts everything in his mouth. The area of the monkey's brain that was removed was the:

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The amygdala is responsible for processing emotions, particularly fear and anxiety. By removing this area of the monkey's brain, it has become very friendly and no longer fears objects it used to. The other areas listed are not as directly related to emotional processing as the amygdala.

Dr Garza Removed an Area of the Brain of a Rhesus