Rhesus monkeys were exposed to lesioning of a specific brain area, and when they woke up they showed a pronounced decrease in their fear responses. The part of the brain that was most likely under investigation in this study was the .

Amygdala

Explanation:

Amygdala is a region in the cerebral hemisphere that is roughly almond in shape with grey on it, it plays the role of experiencing emotions. It is a component of the limbic system, it's vital role is the processing of fear. The Amygdala was the section under this study.

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