Over the last three decades, popular science authors have used evolutionary mismatch theory to shed light on a vast number of modern social problems, pointing to differences between contemporary environments and those of humanity’s distant ancestors. These authors argue that the majority of Homo sapiens’ existence took place in the Pleistocene (approximately 2 million to 10,000 years BCE), and so this epoch presented the greatest adaptive challenges to the species’ survival and reproduction. These were the contexts that shaped modern human physiology and sociality through natural selection. Large-scale civilizations, they argue, no longer resemble this so-called “environment of evolutionary adaptedness,” even though the humans that inhabit them retain the genetic and psychological makeup of their Pleistocene precursors. Many contemporary problems of Western social life, the story goes, can thus be attributed to this mismatch between the evolved human-animal and the novel problems of the present. As evolutionary psychologists John Tooby (read more...)