http://www.nytimes.com/2014/03/26/us/trying-to-close-a-knowledge-gap-word-by-word.html
http://neuroscience.uth.tmc.edu/s4/chapter08.html
http://lcnl.wisc.edu/
http://www.psych.nyu.edu/nellab/
http://www.cw.com.tw/blog/blogTopic.action?id=5&nid=4249#a59135