Search results
Results from the WOW.Com Content Network
Individual rats would rarely eat except in the company of other rats. As a result extreme population densities developed in the pen adopted for eating, leaving the others with sparse populations. In the experiments in which the behavioral sink developed, infant mortality ran as high as 96 percent among the most disoriented groups in the population.
Tryon's Rat Experiment is a psychology experiment conducted by Robert Tryon in 1940 and published in the Yearbook of the National Society for Studies in Education. [ 1 ] Experiment set-up
Group CC was isolated in laboratory cages when they were weaned at 22 days of age, and lived there until the experiment ended at 80 days of age; Group PP was housed in Rat Park for the same period; Group CP was moved from laboratory cages to Rat Park at 65 days of age; and Group PC was moved out of Rat Park and into cages at 65 days of age.
Moreover, the rats were not randomly scattered throughout the pen area, but had organized themselves into twelve or thirteen local colonies of a dozen rats each. 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.
In the 1940s, influenced by the studies of his former professor Edward C. Tolman, Tryon decided to test the theory that intelligence is an inherited trait. [2] To do this, he tested the ability of laboratory rats to navigate a maze: rats who took fewer wrong turns to get through the maze and reach the food at the end were termed "maze-bright", while those who took many wrong turns were termed ...
In 1900 and 1901, he published journal two of three in "Experimental Study of the Mental Processes of the Rat" in the American Journal of Psychology. [2] The maze he used in this study was an adaptation of the Hampton Court Maze , as suggested to him by Edmund Sanford at Clark University .
Scientists hope that these human-rat transplants will help them study how genetic mutations influence brain circuits and affect how people behave. Rats' behavior changed after human tissue was ...
Before the experiment, Albert was given a battery of baseline emotional tests: the infant was exposed, briefly and for the first time, to a white rat, a rabbit, a dog, a monkey, masks (with and without hair), cotton, wool, burning newspapers, and other stimuli. Albert showed no fear of any of these items during the baseline tests.