Those with high motor excitability have better working memory
People with a high motor excitability have better working memory than their peers with low excitability. Using transcranial magnetic stimulation, researchers found that people with high motor excitability have increased working memory. Interesting to note: working memory deficits are a component of ADHD, et al.
http://www.sciencedaily.com/releases/2013/12/131223083815.htm