In the localization debate, researchers have argued that memory is located in specific parts of the brain, and specific neurons can be recognized for their involvement in forming memories.

Specific Neurons in Memory Formation

Karl Lashley's research sparked a scientific debate on whether memory is distributed across the entire brain or located in specific regions. While some scientists believe the whole brain is involved in memory, others argue that memory storage is localized to specific brain regions.

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In an early attempt to physically locate the engram, Karl Lashley conducted experiments in which he created brain lesions in rats after they had learned to navigate a maze. He found that the rats retained the ability to find their way through the maze regardless of the size or specific location of the brain damage, demonstrating a lack of evidence for a localized memory trace.

Karl Lashley's Lesion Experiments

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

The equipotentiality hypothesis, formulated by Karl Lashley in 1950, posits that if a specific part of the brain involved in memory is damaged, another part of that same area can take over that memory function. Lashley developed this theory based on the animals' reactions in his lesion experiments, where rats could still navigate a maze regardless of the size or location of the lesion.

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