was an experiment conducted on rats at a research facility in America. They were selected based on their performance on a standard maze activity then inter-bred to produce the best and worst rat populations in completing the maze tasks. The maze bright rats could navigate the maze without any real problem whereas the maze dull rats would find the entire experiment near impossible to complete.
MAZE-BRIGHT AND MAZE-DULL RATS: "There two sets of rat- maze-bright and maze-dull rats who were tested using maze activities. The two groups were then interbred to produce generations of rat which were either exceptionally good at maze tasks or exceptionally bad at maze tasks."