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Behavioral Sink
Calhoun retired from NIMH in 1984, but continued to work on his research results until his death on September 7, 1995.

The experiments
While Calhoun was working at NIMH in 1954, he began numerous experiments with rats and mice. During his first tests, he placed around 32 to 56 rodents in a 10 x 14-foot case in a barn in Montgomery County. He seperated the space into four rooms. Every room was specificly created to support a dozen matured brown Norwegian rats. Rats could maneuver between the rooms by using the ramps. Since Calhoun provided unlimited resources, such as water, food, and also protection from predators as well as disease and weather, the rats were said to be in “rat utopia” or “mouse paradise,” another Psychologist explained.

Influence of the concept
"Calhoun's work with rats inspired the 1971 children's book, Mrs. Frisby and the Rats of NIMH, by Robert C. O'Brien, which was adapted into a 1982 animated film, The Secret of NIMH."