testing wikipedia page http://www.alleydog.com/glossary/definition.php?term=Top-Down%20Processing
http://www.cs.tut.fi/~klap/iiro/topdown.html
http://www.visionlab.harvard.edu/members/patrick/pdf.files/topdownmitecs.pdf
http://home.gwu.edu/~droliver/TopDown/
http://www.ucs.louisiana.edu/~cgc2646/LRN/TOPDOWN.htm
http://www.intropsych.com/ch07_cognition/top-down_and_bottom-up_processing.html
http://penta.ufrgs.br/edu/telelab/3/top-down.htm
http://iteslj.org/Techniques/Lingzhu-Listening.html
http://artsci.wustl.edu/~rtreiman/Selected_Papers/Treiman_Handbook_of_linguistics_2001.pdf
http://www.jneurosci.org/content/32/35/12277.abstract