The stress response begins in the brain (see illustration). When someone confronts an oncoming car or other threat, the eyes or ears (or both) send the information into the amygdala, an area of the brain which contributes to psychological processing. The amygdala interprets the sounds and images. If it perceives threat, it instantly sends a distress signal to the hypothalamus. The hypothalamus in the brain is in control of the stress reaction. When a stress reaction is triggered, 應激反應 it sends signals into two different structures: the adrenal gland, and the adrenal medulla. These short term responses are Made by The Fight or Flight Response via the Sympathomedullary Pathway,