Researchers found that when lovers looked at eachother, dopamine flooded the brain. This is the same neurotransmitter that is linked with the sensations of reward and pleasure in the brain, and was viewed as the brain's "love potion."
Dopamine is a hormone and neurotransmitter, when released in the right proportions, leads to feelings of exhilaration, increased energy, and motivation to win rewards. This is why couples newly in love can feel a sensation of excitement and risk-taking when they are together.
Oxytocin is a hormone that promotes bonding. Notably, it is released by mothers who are breastfeeding their newborns. Researchers believe that it is the release of this hormone that leads to a feeling of closeness or bonding between partners in a relationship.
Oxytocin is a hormone which promotes a feeling of connection between partners. It makes partners feel much closer to each other, and it is thought that in relationships that crumble once the high (of dopamine) is gone, there is a high chance the couple has not found a way to stimulate or sustain oxytocin release.
Serotonin is a major neurotransmitter in the brain, responsible for obsessiveness and happiness.
Researchers found that subjects who had fallen in love in the past 6 months, and obsessed over this loving relationship had comparable serotonin levels as those with OCD, linking this neurotransmitter to obsessiveness.
Furthermore it was found that drugs like Prozac, Zoloft and Paxil, which are antidepressant medications that also treat OCD, weren't helpful for relationships. As these medications can cause the symptoms of OCD to dissipate, similarly, lovers who had been in relationships had dulled love and libido. Thus, these antidepressant drugs, which increase serotonin levels (which is supposed to make you happy), lead to relationships going stale.
As relationships progress in terms of duration, experience and maturity, the brain becomes sensitized to these floods of neurotransmitters. Thus, romantic love fades due to chemical tolerance, but the relationship progresses. This is because the relationships are no longer under the influence of neurotransmitters influencing thoughts and feelings, but due to conscious decisions to be together.
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