From The Dana Foundation:
Study the literature of the world and you will find one theme that transcends both time and culture: that of love. Whether you are reading Shakespeare or Rumi, the manner in which love is described shows remarkable similarity. Those similarities go far beyond the page: Neuroscientists are now demonstrating that romantic love is also represented by a unique pattern of activation in the brain.
The neuroimaging of love
In the past six years, several groups of researchers have sought to localize romantic love in the brain using functional magnetic resonance imaging (fMRI) techniques. Though some have criticized the attempt as nothing more than modern day phrenology, those who seek the neural correlates of love believe it an essential avenue of study.
“The study of love is important so we might bring some rationality to a complex and emotional phenomenon,” says Stephanie Ortigue, a neuroscientist at Syracuse University. “These studies allow scientists to show that love is not a drug or a pathology but something that has a unique signature in the healthy brain.”