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The vertical chamber, or pit of despair, was a device used in experiments conducted on rhesus macaque monkeys during the 1970s by American comparative psychologist Harry Harlow and his students at the University of Wisconsin.  The aim of the research was to produce an animal model of human clinical depression.
The vertical chamber was 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 equiped with a food box and a water-bottle holder, and was covered with a pyramid top[removed in the accompanying photograph], designed to discourage incarcerated subjects from hanging from the upper part of the chamber. 
Harlow placed baby monkeys in the chamber alone for up to six weeks. Within a few days, they stopped moving about and remained huddled in a corner. The monkeys were found to be psychotic when removed from the chamber, and most did not recover.
After 30 days, the "total isolates," as they were called, were found to be "enormously disturbed": two of them refused to eat and starved themselves to death.  After being isolated for a year, the monkeys were found initially to barely move, didn't explore or play, were incapable of having sexual relations. When put with other monkeys for a daily play session, they were badly bullied by the other monkeys.
In order to find out how the isolates would parent, Harlow devised what he called a "rape rack," to which the female isolates were tied in the position taken by a normal female monkey in order to be impregnated. Artifical insemination had not been developed at that time. 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.  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 hadn't 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. 
- REDIRECT Template:Animal liberation
The technical name for the new depression chamber was "vertical chamber apparatus," though Harlow himself called it the "pit of despair," "well of despair," "dungeon of despair," and "well of loneliness." 
Most of the monkeys placed inside it were at least three months old and had already bonded with others. The point of the experiment was to break those bonds in order to create the symptoms of depression.
According to Harlow: "most subjects typically assume a hunched position in a corner of the bottom of the apparatus. One might presume at this point that they find their situation to be hopeless." 
Steven Suomi, one of Harlow's many doctoral students, placed some monkeys in the chamber for his PhD. He wrote that he could find no monkey who had any defense against it. Even the happiest monkeys came out damaged. He concluded that even a happy, normal childhood was no defense against depression.
The experiments delivered what Deborah Blum has called "common sense results": that monkeys, very social animals in nature, when placed in isolation emerge badly damaged, and that some recover and some do not. 
Gene Sackett of the University of Washington in Seattle, and another of Harlow's doctoral students who went on to conduct additional deprivation studies, told Blum that, in his view, the animal liberation movement in the U.S. was born as a result of Harlow's experiments, but Willam Mason, another of Harlow's students, who also continued deprivation experiments after leaving Wisconsin, told Blum that Harlow "kept this going to the point where it was clear to many people that the work was really violating ordinary sensibilities, that anybody with respect for life or people would find this offensive. It's as if he sat down and said, 'I'm only going to be around another ten years. What I'd like to do, then, is leave a great big mess behind.' If that was his aim, he did a perfect job." 
- Animal testing
- Britches (monkey)
- Primate experimentation at Cambridge University
- Silver Spring monkeys
- Unnecessary Fuss (video showing brain damage experiments on baboons)
- Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, p. 95.
- Suomi, Stephen John. Experimental Production of Depressive Behavior in Young Rhesus Monkeys: A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Psychology) at the University of Wisconsin. University of Wisconsin, 1971, p. 33.
- Stephens, M.L. Maternal Deprivation Experiments in Psychology: A Critique of Animal Models. AAVS, NAVS, NEAVS, 1986, p. 17.
- Blum, Deborah. Love at Goon Park: Harry Harlow and the Science of Affection. Perseus Publishing, 2002, p. 216.
- Blum, Deborah. Love at Goon Park: Harry Harlow and the Science of Affection. Perseus Publishing, 2002, p. 217.
- Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, p. 218.
- Blum, Deborah. Love at Goon Park: Harry Harlow and the Science of Affection. Perseus Publishing, 2002, p. 225.
- Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, p. 96.
- Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, ISBN 0-19-510109-X
- Blum, Deborah. Love at Goon Park: Harry Harlow and the Science of Affection. Perseus Publishing, 2002, ISBN 0-7382-0278-9
- Stephens, M.L. Maternal Deprivation Experiments in Psychology: A Critique of Animal Models. AAVS, NAVS, NEAVS, 1986.
- Harry Harlow's Monkey Love Experiments
- Slater, Lauren. Opening Skinner's Box: Great Psychological Experiments of the Twentieth Century. W.W. Norton & Company, 2004, ISBN 0-393-05095-5
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