![]() What had happened?Įmployed in the Laboratory of Psychology of the National Institute of Mental Health from 1954, and later as Chief of the Unit for Research on Behavioral Systems in the Laboratory of Brain, Evolution and Behavior until 1986, Calhoun repeated the experiment in specially constructed "rodent universes." Using a variety of strains of rats and mice, he once more provided his populations with food, bedding, and shelter. (1) Be that as it may, a population of only 150 seemed surprisingly low. That the predicated maximum was never reached ought to come as no surprise: 5000 rats would be tight indeed. ![]() ![]() Instead, the population levelled off at 150, and throughout the two years Calhoun kept watch, never exceeded 200. What Calhoun built was quarter acre pen, what he called a "garden of eden," and, as the population expanded from a few individuals to many, a "rat city." Calhoun calculated that the habitat was sufficient to accommodate as many as 5000 rats. Calhoun would later reflect that his neighbor probably expected a few hutches, perhaps a small run. Calhoun's neighbor agreed to let him build a rat enclosure on disused woodland behind his house in Towson, Maryland. APA style: Escaping the Laboratory: the rodent experiments of John B.Calhoun & their cultural influence." Retrieved from Escaping the Laboratory: the rodent experiments of John B. Calhoun & their cultural influence." The Free Library. MLA style: "Escaping the Laboratory: the rodent experiments of John B.
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