Some articles on affective factors

http://www.esp-world.info/Articles_21/Docs/Age.pdf

http://www.celea.org.cn/teic/78/08070227.pdf

http://www.linguist.org.cn/doc/su200505/su20050501.pdf

http://www.antonellapavese.com/papers/timeperception.pdf

http://sunzi.lib.hku.hk/hkjo/view/33/3300029.pdf

http://www.ses-online.jp/ronbun/30/b-kimura-5-20.pdf