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Scanning the brains of people in love is also helping to refine sciences grasp of loves various forms. Helen Fisher, a researcher at Rutgers University, and the author of a new book on love*, suggests it comes in three flavours: lust, romantic love and long-term attachment. There is some overlap but, in essence, these are separate phenomena, with their own emotional and motivational systems, and accompanying chemicals. These systems have evolved to enable, respectively, mating, pair-bonding and parenting. 对恋爱中人们大脑的扫描，也有助于使科学对各种形式爱情的领会变得更为精确。Rutgers 大学的一位研究人员Helen Fisher，同时是一本关于爱情的新书作者，她提出，爱会以三种滋味出现：欲望，浪漫的恋爱和长期的附属关系。三种滋味的爱情虽有一些重叠，但本质上是截然不同的现象，并且具有各自的情绪和激发系统，以及相伴的体内化学物质。这些系统通过进化后以分别让交配，伴侣联接和养育子女成为可能。 Lust, of course, involves a craving for sex. Jim Pfaus, a psychologist at Concordia University, in Montreal, says the aftermath of lustful sex is similar to the state induced by taking opiates. A heady mix of chemical changes occurs, including increases in the levels of serotonin, oxytocin, vasopressin and endogenous opioids (the bodys natural equivalent of heroin). This may serve many functions, to relax the body, induce pleasure and satiety, and perhaps induce bonding to the very features that one has just experienced all this with, says Dr Pfaus. | 
