Karl Lashley trained rats to solve a maze and then removed pieces of their cortexes.He observed that storage of their maze memory:

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Karl Lashley's experiments led him to conclude that memory was not localized to specific regions of the cortex, but instead was distributed throughout the brain. This idea is now known as the principle of equipotentiality, which states that any part of a functional area of the brain can substitute for another part in the performance of a particular task. Therefore, the removal of pieces of the rats' cortexes did not lead to a loss of maze memory, as the memory was not restricted to a specific area.

Karl Lashley Trained Rats to Solve a Maze and Then