Tanner explained that it's not only gray matter that's important for memory. "In Parkinson's disease, white matter connections between the temporal lobe and a region in the posterior portion of the brain called the retrosplenial cortex were particularly important in the recall of verbal information," he said in the news release.
"People with Parkinson's disease who had stronger connections between these areas of the brain did better at remembering information," he said.
Found this article on CBS 
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