Their meta-analysis revealed that when a person falls in love, 12 areas of the brain work in tandem to release euphoria-inducing chemicals such as dopamine, oxytocin, adrenaline and vasopression. The love feeling also affects sophisticated cognitive functions, such as mental representation, metaphors and body image, which may explain why peoples’ abilities and behaviors are all over the psychology map when they are in a new relationship.

Other researchers also found blood levels of nerve growth factor (NGF), the molecule involved in the social chemistry of humans, also increased. NGF levels were significantly higher in couples who had just fallen in love.

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