Chemical basis for love
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love has been explored by such biological sciences as evolutionary psychology, evolutionary biology, anthropology and neuroscience. Specific chemical substances such as oxytocin are studied in the context of their roles in producing human experiences and behaviors that are associated with love.
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[edit] Evolutionary psychology
From the perspective of evolutionary psychology the experiences and behaviors associated with love can be investigated in terms of how they have been shaped by human evolution.[1] For example, it has been suggested that human language has been selected during evolution as a type of "mating signal" that allows potential mates to judge reproductive fitness.[2] Miller described evolutionary psychology as a starting place for further research: "Cognitive neuroscience could try to localize courtship adaptations in the brain. Most importantly, we need much better observations concerning real-life human courtship, including the measurable aspects of courtship that influence mate choice, the reproductive (or at least sexual) consequences of individual variation in those aspects, and the social-cognitive and emotional mechanisms of falling in love." Since Darwin's time there have been similar speculations about the evolution of human interest in music also as a potential signaling system for attracting and judging the fitness of potential mates.[3] It has been suggested that the human capacity to experience love has been evolved as a signal to potential mates that the partner will be a good parent and be likely to help pass genes to future generations.[4]Evolutionary theory also suggests that love keeps two people together, and this would help raise a child. For example, a man and a woman who love each other would be together and work together to raise a child. Back in the tribal days—when much of human evolution took place—it would probably require two people to successfully raise an offspring, and a mother with a supporting partner would probably have more surviving offspring than a mother who does not have such a partner. Thus, people with the ability to form love would produce more offspring than those without that ability. And these offspring would have the genes for love. Thus, the genes for love would become common, and that is why most people today have the ability to love.
[edit] Neurochemistry
Studies in neuroscience have involved chemicals that are present in the brain and might be involved when people experience love. These chemicals include: nerve growth factor,[5] testosterone, estrogen, dopamine, norepinephrine, serotonin, oxytocin, and vasopressin.[6] Adequate brain levels of testosterone seem important for both human male and female sexual behavior.[7] Dopamine, norepinephrine, and serotonin are more commonly found during the attraction phase of a relationship.[citation needed] Oxytocin and vasopressin seemed to be more closely linked to long term bonding and relationships characterized by strong attachments.The conventional view in biology is that there are two major drives in love — sexual attraction and attachment.[8] Attachment between adults is presumed to work on the same principles that lead an infant to become attached to his or her mother or father– or both.
The chemicals triggered that are responsible for passionate love and long-term attachment love seem to be more particular to the activities in which both persons participate rather than to the nature of the specific people involved.[8]
Anthropologist Helen Fisher also adds lust to the experience of love. Lust exposes people to others, and is the initial passionate sexual desire that promotes mating, and involves the increased release of chemicals such as testosterone and estrogen. These effects rarely last more than a few weeks or months.
[edit] Serotonin
Chemically, the serotonin effects of being infatuated have a similar chemical appearance to obsessive-compulsive disorder; which could explain why people experiencing infatuation cannot think of anyone else.[9] For this reason some[who?] assert that taking SSRIs and other antidepressants impede one's ability to fall in love. In one particular case anthropologist Helen Fisher noted:I know of one couple on the edge of divorce. The wife was on an antidepressant. Then she went off it, started having orgasms once more, felt the renewal of sexual attraction for her husband, and they're now in love all over again.[10]
[edit] Oxytocin
Main article: Oxytocin
The long-term attachment felt after the initial "in love" passionate phase of the relationship ends is related to oxytocin, a chemical released after orgasm.[11] Moreover, novelty triggers attraction. Even exercising for several minutes can make one more attracted to other people on account of increased heart rate and other physiological responses.[citation needed]
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