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To build on busukxuan's answer, there are a lot of single-celled organism responses that kind of resemble memory: Slime mold uses an externalized spatial 'memory' to navigate in complex environments - essentially, a slime mold leaves behind a trail, which it then avoids, allowing it to avoid where it has traveled in the past. If you apply a periodic ...


Short answer Training increases white and gray matter densities in the brain. This may reflect increases in neuronal cell counts especially in the hippocampus. In the cortex, however, such observed changes are probably more reflective of other processes, such as synaptogenesis. Background Gray matter is generally viewed as being the neuronal cell bodies, ...

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