Love or lust depends on which area of brain gets activated
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In a recent international study, researchers have drawn an exact map of the intimately linked feelings of love and sexual desire in the brain.
Thanks to modern science, we know that love lives in the brain, not in the heart.
"No one has ever put these two together to see the patterns of activation," Jim Pfaus, professor of psychology at Concordia University, said.
"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," he said.
Along with colleagues in the USA 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 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 is associated with drug addiction.
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