Summary :- 'Amygdala' is the part of human brain that controls fear. If you remove it, you would lose any sense of fear.

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The fear response starts in a region of the brain called the amygdala. This almond-shaped set of nuclei in the temporal lobe of the brain is dedicated to detecting the emotional salience of the stimuli – how much something stands out to us. This experiment has been repeated in animals numerous times, and the scientific consensus is that when the amygdala is removed, an animal loses any sense of fear. Now, scientists have confirmed that a missing amygdala results in similar behavior in humans, according to a study in the journal Current Biology. Output pathways: include projections to brainstem, hypothalamic, and cortical areas mediating fear and other emotional responses. Studies have also found that the amygdala modulates the fear response in humans.