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The pit of despair was a name used by American comparative psychologist Harry Harlow for a device he designed, technically called a vertical chamber apparatus, that he used in experiments on rhesus macaque monkeys at the University of Wisconsin–Madison in the 1970s.〔Blum 1994, p. 95, Blum 2002, pp. 218-219. Blum 1994, p. 95: "... the most controversial experiment to come out of the Wisconsin laboratory, a device that Harlow insisted on calling the "pit of despair."〕 The aim of the research was to produce an animal model of clinical depression. Researcher Stephen Suomi described the device as "little more than a stainless-steel trough with sides that sloped to a rounded bottom": A 3/8 in. wire mesh floor 1 in. above the bottom of the chamber allowed waste material to drop through the drain and out of holes drilled in the stainless-steel. The chamber was equipped with a food box and a water-bottle holder, and was covered with a pyramid top (in the accompanying photograph ), designed to discourage incarcerated subjects from hanging from the upper part of the chamber.〔Suomi 1971, p. 33.〕 Harlow had already placed newly born monkeys in isolation chambers for up to one year. With the pit of despair, he placed monkeys between three months and three years old in the chamber alone, after they had bonded with their mothers, for up to ten weeks.〔McKinney, Suomi, and Harlow 1972.〕 Within a few days, they had stopped moving about and remained huddled in a corner. ==Background== Much of Harlow's scientific career was spent studying maternal bonding, what he described as the "nature of love". These experiments involved rearing newborn monkeys with surrogate mothers, ranging from toweling-covered cones to a machine that modeled abusive mothers by assaulting the baby monkeys with cold air or spikes.〔Slater, Lauren. ''Opening Skinner's box: great psychological experiments of the twentieth century'', W. W. Norton & Company, 2005, ISBN 0-393-32655-1, pp.136-40.〕 The point of the experiments was to pinpoint the basis of the mother-child relationship, namely whether the infant primarily sought food or affection. Harlow concluded it was the latter. In 1971, Harlow's wife died of cancer and he began to suffer from depression. He was treated and returned to work but, as Lauren Slater writes, his colleagues noticed a difference in his demeanor.〔Slater 2005, pp. 251-2〕 He abandoned his research into maternal attachment and developed an interest in isolation and depression. Harlow's first experiments involved isolating a monkey in a cage surrounded by steel walls with a small one-way mirror, so the experimenters could look in, but the monkey could not look out. The only connection the monkey had with the world was when the experimenters' hands changed his bedding or delivered fresh water and food. Baby monkeys were placed in these boxes soon after birth; four were left for 30 days, four for six months, and four for a year. After 30 days, the "total isolates," as they were called, were found to be "enormously disturbed." After being isolated for a year, they barely moved, did not explore or play, and were incapable of having sexual relations. When placed with other monkeys for a daily play session, they were badly bullied. Two of them refused to eat and starved themselves to death.〔Blum 2002, p. 216.〕 Harlow also wanted to test how isolation would affect parenting skills, but the isolates were unable to mate. Artificial insemination had not then been developed; instead, Harlow devised what he called a "rape rack," to which the female isolates were tied in normal monkey mating posture. He found that, just as they were incapable of having sexual relations, they were also unable to parent their offspring, either abusing or neglecting them. "Not even in our most devious dreams could we have designed a surrogate as evil as these real monkey mothers were," he wrote.〔Blum 2002, p. 217.〕 Having no social experience themselves, they were incapable of appropriate social interaction. One mother held her baby's face to the floor and chewed off his feet and fingers. Another crushed her baby's head. Most of them simply ignored their offspring.〔 These experiments showed Harlow what total and partial isolation did to developing monkeys, but he felt he had not captured the essence of depression, which he believed was characterized by feelings of loneliness, helplessness, and a sense of being trapped, or being "sunk in a well of despair," he said.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pit of despair」の詳細全文を読む スポンサード リンク
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