Because the heart is in the central location in the body, it was once thought that the heart, not the brain, was the location for all thought processes. This idea that emotions were associated with the heart is found in Egyptian mythology and Biblical references. As this heart-brain link was dispelled, many believe that the love association remained because of the tendency of the heart to race in response to adrenaline when we find ourselves attracted to another person.
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[When the brain was finally identified as the seat of emotion? In 1937, American neuroanatomist James Papez became famous for being the first to link a “circuit” in the brain to “emotion, as commonly used implies two conditions : a way of acting and a way of feeling.” A Proposed Mechanism of Emotion]