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During his first tests, he placed around 32 to 56 rats in a 10-by-14-foot (3.0 m × 4.3 m) cage in a barn in Montgomery County. He separated the space into four rooms. Every room was specifically created to support a dozen matured brown Norwegian rats. Rats could maneuver between the rooms by using the ramps.
The "Rats Dungeon", or "Dungeon of the Rats", was a feature of the Tower of London alleged by Catholic writers from the Elizabethan era. "A cell below high-water mark and totally dark" would draw in rats from the River Thames as the tide flowed in. Prisoners would have their "alarm excited" and in some instances, have "flesh ... torn from the arms and legs".
To test this hypothesis, Alexander and his colleagues built Rat Park, a large housing colony 200 times the floor area of a standard laboratory cage. There were 16–20 rats of both sexes in residence, food, balls and wheels for play, and enough space for mating. [2]
He noted that twelve rats is the maximum number that can live harmoniously in a natural group, beyond which stress and psychological effects function as group break-up forces. [citation needed] While posted at Jackson Lab in Bar Harbor, Maine, Calhoun continued studying the Norway rat colony until 1951. While in Bar Harbor, his first daughter ...
Commonly used animals include rodents (usually lab rats), pigeons, and primates. The chamber is often sound-proof and light-proof to avoid distracting stimuli. Operant conditioning chambers have at least one response mechanism that can automatically detect the occurrence of a behavioral response or action (i.e., pecking , pressing, pushing, etc.).
[2] The term rat is also used in the names of other small mammals that are not true rats. Examples include the North American pack rats (aka wood rats [3]) and a number of species loosely called kangaroo rats. [3] Rats such as the bandicoot rat (Bandicota bengalensis) are murine rodents related to true rats but are not members of the genus ...