As we tell students, be careful trusting what you get off the Internet. The explanation (and spelling) of the Hermann Grid illusion that is given on the web site is wrong. Consistent with the "contrast illusion", white in the Hermann Grid illusion looks brighter when the surrounding region is primarily black, and darker when the surrounding region is primarily white. The intersection is the intersection of two white areas, so the middle of the intersection looks darker. In other regions, the white lines are bordered by two black squares, so they look lighter.
>>> [EMAIL PROTECTED] 9/22/04 6:01:44 AM >>> On Wed, 22 Sep 2004 00:00:18 -0400, Teaching in the Psychological Refering to the illusions involving contrast - http://www.sandlotscience.com/Contrast/Contrast_frm.htm Rule stated re Herman Grid (White's Illusion, no.14): "white tends to look darker when it is surrounded by black" Rule stated re "a contrast illusion" (no. 4): "We tend to see white as whiter next to black" Are these not contradictory? Michael T. Scoles, Ph.D. Interim Chair, Dept. Psychology & Counseling University of Central Arkansas Conway, AR 72035 --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]
