This Is Your Brain On Parasites: How Tiny Creatures Manipulate Our Behavior and Shape Society

Kathleen McAuliffe

jun 2016 · HarperCollins

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“Engrossing . . . [An] expedition through the hidden and sometimes horrifying microbial domain.” —The Wall Street Journal



Parasites can live only inside another animal and, as Kathleen McAuliffe reveals, these tiny organisms have many evolutionary motives for manipulating the behavior of their hosts. With astonishing precision, parasites can coax rats to approach cats, spiders to transform the patterns of their webs, and fish to draw the attention of birds that then swoop down to feast on them. We humans are hardly immune to their influence. Organisms we pick up from our own pets are strongly suspected of changing our personality traits and contributing to recklessness and impulsivity—even suicide. Germs that cause colds and the flu may alter our behavior even before symptoms become apparent.



Parasites influence our species on the cultural level, too. Drawing on a huge body of research, McAuliffe argues that our dread of contamination is an evolved defense against parasites. The horror and revulsion we are programmed to feel when we come in contact with people who appear diseased or dirty helped pave the way for civilization, but may also be the basis for major divisions in societies that persist to this day. This Is Your Brain on Parasites is both a journey into cutting-edge science and a revelatory examination of what it means to be human.



“If you’ve ever doubted the power of microbes to shape society and offer us a grander view of life, read on and find yourself duly impressed.” —Bookforum

“Fascinating—and full of the kind of factoids you can’t wait to share.” —Scientific American

“Humorous, inspiring, and macabre, this is infectious reading in the tradition of giants like Robert S. Desowitz and Jared Diamond.” —Michael A. Huffman, Primate Research Institute, Kyoto University

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KATHLEEN MCAULIFFE is a contributing editor to Discover. Her work has appeared in over a dozen national magazines, including Discover, the New York Times Magazine, Atlantic, and Smithsonian. From 1999 to 2006, she was also a health columnist for More. Her work has been published in Best American Science Writing, and has received several grants and awards, including a science writing fellowship from the Marine Biological Laboratory at Woods Hole. She has appeared numerous times on TV and radio, and was interviewed by To the Point, the nationally syndicated Osgood FIle, and other programs after her 2012 Atlantic feature "How Your Cat Is Making You Crazy" became the second most widely read article in the magazine's history. McAuliffe lives in Miami with her husband—a research physicist—and her two children.