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implicated in reward processing and learning. It’s a little like bribery: when we experience something that feels good, such as satiating our hunger, having a sexy romp, or spending time with the object of our affections, these areas of the brain give us a little extra boost to encourage us to do it again. If we are talking about deep emotional attachment, the ventral pallidum, a differentpart of the basal ganglia circuitry, is activated. All these areas are very sensitive to the neurochemicals dopamine, oxytocin, and vasopressin, which are thought to be pleasure-inducing and critical to forming pair-bonds in socially monogamous animals (to be discussed in more detail in chapter 3). But they each work a little differently. 6
    The two regions that seemed most important to romantic love in the Fisher study were the caudate nucleus and the VTA. These areas reside in what is called the “reptilian brain”—a cluster of subcortical regions near the brain stem that have existed since before we evolved to walk upright—and are strongly implicated in both reward processing and euphoric feelings. They are also part of an important dopamine-fueled circuit called the mesocortical limbic system, a pathway critical to motivational systems; unsurprisingly it’s a circuit that has been implicated in addiction. These study results led Fisher, Aron, and Brown to conclude that romantic love is not an emotion, but a drive. According to Brown, “Love is there to help fuel reproduction, to help us psychologically by connecting with others. It is distinct, yet related to lust and attachment.”
    Think of it this way: Lust may be the simplest of the three hypothesized systems, an almost reflex-like process that keeps us getting busy. Certainly if it were a more involved process, we would not find ourselves so interested in individuals like Pamela Anderson in all her Baywatch glory or, like one of my girlfriends who is too embarrassed to be named, totally hot for the Jersey Shore ’s resident Lothario, Mike “The Situation” Sorrentino, right? At the same time we also have a system for attachment. Feeling connected to someone is a rewarding behavior, hence that ventral pallidum activation; it is nice to have someone to come home to, even if you are no longer inclined to jump his or her bones 24/7. Somewhere in the middle is the romantic love system, connected to both lust and attachment. It hits on areas involved in attachment and lust, as well as those implicated in reward processing and learning. It is no surprise that romantic love feels good and helps us to bond with another person (and consequently promotes procreation).
    “These brain systems often work together, but I think it’s fair to say they often don’t work together too,” Fisher told me when I asked whether these three systems overlapped in other ways. “One might feel deep attachment for one partner, bein romantic love with another partner, and then be sexually attracted to many others. There’s overlap, but like a kaleidoscope, the patterns are different.” It is also possible that these systems work on a bit of a continuum: one’s physical attraction for a person can develop over time into romantic love and then into a deep-seated attachment. It might even work the other way: a good friend to whom you are deeply attached may one day, inexplicably, seem physically irresistible. A quick flick of the wrist, a change in circumstance or age, and the kaleidoscope may offer you a completely different configuration.
    Love Also Deactivates
    At times active brain areas are not the only ones that are important to understanding function; deactivated areas can tell us something too. These neuroimaging studies have also shown decreased activation, which may be related to decreased function, in certain brain areas. The frontal lobe, the parietal lobe, and the amygdala show diminished blood flow in love and attachment. They say love is blind, and if you’ve ever been in love