Emotional reactivity is the opposite of a separate self as it is experienced.
According to studies, your brain perceives the emotional reactivity of sadness in the same way that it perceives physical pain, which is why you can believe that your heartbreak is physically hurting you. The long answer is that the parasympathetic activation system (also known as the rest-and-digest response, which slows the heart) and the sympathetic activation system (most frequently referred to as the fight-or-flight stress that ramps up coronary heart and lung activity) may both be simultaneously activated by hormones, causing the pain.
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