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PsychLink 4-1: Perception Demonstrations
http://psych.hanover.edu/Krantz/sen_tut.html

PsychLink 4-2: International Society for Psychophysics
http://www.psychology.adelaide.edu.au/psychophysics/

PsychLink 4-3: The Fading Dot
http://www.exploratorium.edu/exhibits/fading_dot/fading_dot.html

PsychLink 4-4: Visual Perception
http://www.yorku.ca/eye/

PsychLink 4-5: Anatomy of the Eye
http://www.nei.nih.gov/photo/eyean/index.htm

PsychLink 4-6: Explanation of Color Blindness
http://www.yorku.ca/eye/cvv.htm

PsychLink 4-7: Sound Waves
http://www.science.wayne.edu/~wpoff/cor/sen/hearstim.html

PsychLink 4-8: Taste and Smell
http://www.cvr.uci.edu/psych9b/lectures/lec3notes.html

PsychLink 4-9: Feature analysis
http://www.sp.uconn.edu/~ps256is1/Perccomp.html#iv

PsychLink 4-10: Optical and Sensory Illusions
http://psylux.psych.tu-dresden.de/i1/kaw/diverses%20Material/www.illusionworks.com/

PsychLink 4-11: Analysis of Subliminal Influence
http://www.csicop.org/si/9204/subliminal-persuasion.html

PsychLink 4-12: Extrasensory Perception
http://www.hope.edu/academic/psychology/myerstxt/esp/esp.html