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In keeping with an association to happiness, love is associated with the stimulants dopamine, norepinephrine and serotonin
Research has shown that parts of the brain activated when viewing pictures of partners of individuals with whom they are in love, as compared to pictures of friends, are the same areas that have been associated in previous studies with positive emotions, opioid-induced euphoria, attention to both the emotional states of partners as well as one’s own personal emotional states. When, among the lower animal forms we find individuals without a determined sex, egoism develops free from all restraint. Xxx Notably, these areas affected by exposure to loved ones did not overlap with brain regions typically activated during arousal, further emphasizing that distinct neural-systems exist for emotion-motivating systems of lust and romantic love. There is no manner of doubt but that the normal human being feels a great need