Here is a list of helpful links for your research project.  SOme are specific to one sense.  Some are more to the brain in general or all the senses.  Remember this is just a list for getting started.  Also, be sure to get some non-web sources.

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Seeing

http://www.fi.edu/qa98/me2/me2.html

http://faculty.washington.edu/chudler/bigeye.html

http://faculty.washington.edu/chudler/retina.html

http://faculty.washington.edu/chudler/vispath.html

http://www.accessexcellence.org/AE/AEC/CC/vision_background.html

Hearing

http://www.fi.edu/qa98/me1/me1.html

http://faculty.washington.edu/chudler/bigear.html

Smelling

http://www.fi.edu/qa97/me11/me11.html

http://faculty.washington.edu/chudler/nosek.html

Touch

http://www.fi.edu/qa97/me10/me10.html

http://faculty.washington.edu/chudler/receptor.html

http://faculty.washington.edu/chudler/pain.html

Taste

http://www.fi.edu/qa97/me12/me12.html

http://faculty.washington.edu/chudler/tasty.html

http://faculty.washington.edu/chudler/coltaste.html

General senses and brain

http://faculty.washington.edu/chudler/introb.html

http://www.scientificpsychic.com/workbook/chapter2.htm