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Thanks to modern science, we know that love lives in the brain, not in the heart. But where in the brain is it – and is it in the same place as sexual desire?
A recent international study published in the Journal of Sexual Medicine is the first to draw an exact map of these intimately linked feelings.
“No one has ever put these two together to see the patterns of activation,” says Jim Pfaus, professor of psychology at Concordia University, member of the
Center for Studies in Behavioral Neurobiology and a co-author of the study.
“We didn’t know what to expect – the two could have ended up being completely separate.
It turns out that love and desire activate specific but related areas in the brain.”
Along with colleagues in the U.S. and Switzerland, Pfaus analyzed the results from 20 separate studies that examined brain activity while subjects engaged in
tasks such as viewing erotic pictures or looking at photographs of their significant others.
By pooling this data, the scientists were able to form a complete map of love and desire in the brain.
They found that that two brain structures in particular, the insula and the striatum, are responsible for tracking the progression from sexual desire to love.
The insula is a portion of the cerebral cortex folded deep within an area between the temporal lobe and the frontal lobe, while the striatum is located nearby,
inside the forebrain.
Love and sexual desire activate different areas of the striatum. The area activated by sexual desire is usually activated by things that
are inherently pleasurable, such as sex or food. The area activated by love is involved in the process of conditioning by which things paired with
reward or pleasure are given inherent value. That is, as feelings of sexual desire develop into love, they are processed in a different place in the striatum.
Somewhat surprisingly, this area of the striatum is also the part of the brain that associated with drug addiction.
Pfaus explains there is good reason for this.
“Love is actually a habit that is formed from sexual desire as desire is rewarded. It works the same way in the brain as when people become addicted to drugs.”
An international study co-authored by Concordia psychology professor Jim Pfaus finds that love and desire activate specific but related areas in the brain.
While love may be a habit, it’s not necessarily a bad one. Love activates different pathways in the brain that are involved in monogamy and in
pair bonding. Some areas in the brain are actually less active when a person feels love than when they feel desire. “While sexual desire has a
very specific goal, love is more abstract and complex, so it’s less dependent on the physical presence of someone else,” says Pfaus.
According to Pfaus, cognitive neuroscience has given researchers a deep understanding of where intelligence and problem solving sit in the brain,
but there is still a lot to discover when it comes to love. “I see this paper as a cornerstone,” he says, “in what I hope will turn into more
studies in human social neuroscience that can give us an idea of where love is in the brain.”
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