Thanks for the comment.
Here you can find some more information about that point <a href="http:&#x2F;&#x2F;www.scientificamerican.com&#x2F;podcast&#x2F;episode&#x2F;gum-chewing-may-improve-concentrati-13-03-26&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.scientificamerican.com&#x2F;podcast&#x2F;episode&#x2F;gum-chewin...</a>