PsychLink 3-1: Perception Demonstrations
http://psych.hanover.edu/Krantz/sen_tut.html

PsychLink 3-2: International Society for Psychophysics
http://www.psy.ulaval.ca/~isp/isp.htm

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

PsychLink 3-4: Visual Perception
http://www.yorku.ca/eye/

PsychLink 3-5: Anatomy of the Eye
http://www.nei.nih.gov/photo/eyean/

PsychLink 3-6: Explanation of Color Blindness
http://www.yorku.ca/eye/cvv.htm

PsychLink 3-7: Optical and Sensory Illusions
http://psylux.psych.tu-dresden.de/i1/kaw/diverses%20Material/www.illusionworks.com/

PsychLink 3-8: Analysis of Subliminal Influence
http://www.csicop.org/si/9204/subliminal-persuasion.html

PsychLink 3-9: Extrasensory Perception
http://www.davidmyers.org/Brix?pageID=15