Moreover, his research on nerve degeneration and regeneration is quite familiar in today's world of neuroscience (Stahnisch and Nitsch, 2002). It is hypothesized that Cajal did not like using the word plasticity, and therefore used the term with caution (Berlucci and Butchel, 2009). There is even speculation that he adapted the term plasticity from Ioan Minea, a Russian neuroscientist. Furthermore, it remains ambiguous how he intended to use the term in his work (Stahnisch and Nitsch, 2002).