![]() ![]() John Calhoun introduced the concept of double death: first, the death of the spirit and then, physical death.Īnalyzing the findings from his experiment, Calhoun concluded that once a certain population density is achieved and social roles are filled, societal collapse follows due to the emergence of an outcast stratum, writes RIA Novosti. Some researchers claim that Calhoun’s experiment proved that progress and population development are only possible when there is a need to struggle for survival while paradise conditions cause degradation and extinction of the species. Females began to kill their babies and then finally refused to reproduce.Īt the peak of the experiment, just over two thousand mice lived simultaneously in the pen.Although there were ample food and nesting boxes for continued population growth, Calhoun had to stop his experiment four years after beginning because there were just over a hundred mice left in the pen, and all of them were beyond their reproductive age. Mice began to exhibit various forms of deviant behavior along with bursts of aggression. Those males ignored females but were interested in each other, yet such interest could not lead to the birth of offspring. Those would only care for themselves for days, grooming their fur, eating and sleeping while paying no attention to others. A variety of males termed “the beautiful ones” by Calhoun had appeared. At the final, fourth stage, the mouse population began to shrink. Mice began to show extreme individualism as they no longer strove to establish families. Those single females refused to mate and rejected the courtship of males. Two large groups formed: single males and single females. But Calhoun’s pen had no predators, and adult mice proceeded with abusing the young bluntly. This would be next to impossible in nature as mice that aggressive simply would not survive into old age: they would have been eaten by predators. So-called outcasts had appeared – these were young individuals driven by other adult mice to the center of the pen and prevented from having a normal lifestyle, often harmed physically. ![]() In the third phase of the experiment, when there were already hundreds of mice in the pen, a distribution of social roles became noticeable, with a pronounced hierarchy and grouping into clans. In the next phase, the mice stopped being voracious as they ate less. And that’s when the most interesting things begun. In the first stage of the experiment, the mice reproduced copiously, had an active lifestyle and played willingly. Animals were not subjected to any influences from outside and lived in ideal conditions for their delight. The temperature in the pen averaged about 20 degrees Celsius and was comfortable for mice. Mice always had clean water and plenty of food at their disposal with special nesting boxes where they could set up a dwelling – the pen had enough of these to accommodate a population of several thousand mice. Four pairs of white mice (males and females) were placed there. To that end the scientist had established a dedicated zone in his laboratory at the National Institute of Mental Health. ![]()
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