In 1985 Dr. Marian Diamond of UC Berkeley and Scheibel found that Einstein's brain had four times more "oligodendroglia" - helper cells that speed neural communication-than the brains of 11 gifted people she also studied.    From Wordnik.com.  [The Puzzle Of Genius] Reference

In this area Einstein possessed a significantly greater number of both astrocytes and oligodendroglia (oligodendrocytes) glial cells.    From Wordnik.com.  [democracyarsenal.org] Reference