http://www.itmedia.co.jp/news/articles/1411/28/news111.html

http://gigazine.net/news/20141130-build-better-brain/

https://www.kanaloco.jp/article/81064/cms_id/114111

http://www.asahi.com/articles/ASGCX4DQYGCXUZOB00C.html

http://www.chugoku-np.co.jp/local/news/article.php?comment_id=109621&comment_sub_id=0&category_id=256