Karl Lashley originally believed that the engram, or memory trace, was stored in a particular area of the brain.

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Karl Lashley originally believed in the concept of the "law of equipotentiality," which stated that all areas of the brain were equally able to perform any cognitive function, including memory storage. He later modified his theory to propose the concept of "mass action," which suggested that it was the total mass of brain tissue that contributed to memory storage, rather than a specific area. However, he never believed that the engram was stored in a particular area of the brain.

Karl Lashley Originally Believed That the Engram, or Memory Trace