Maybe it only happens during the vernal equinox... cd
-----Original Message----- From: Stephen Black [mailto:[EMAIL PROTECTED] Sent: Sun 4/18/2004 10:34 AM To: Teaching in the Psychological Sciences Cc: Subject: Wagon-wheel illusion again Today I took my bicycle out of storage. So what, I can hear you say. Ah, but before I jumped on it and pedaled away, I used it as a simple but effective means of examining the wagon-wheel illusion again... ... And, if you remember all that, possibly you also remember my call for a thousand wheels to spin and two thousand eyeballs to examine them? Well, here are the results from one wheel observed by two eyeballs... ... But when I took the bicycle outside and repeated the observations there, I could see no reversal. Not at 9:00 am, not at noon, not in the direction of the light, against it, or at 90 degrees to it. Nada... ... Only 999 wheels and 1,998 eyeballs to go. I hope we can get some further observations on this question. Can anyone confirm Purves' et al assertion of a wagon-wheel effect outdoors with a stationary observer? Stephen References Purves, D., et al (1996). The wagon wheel illusion in movies and reality. National Academy of Sciences (USA), 93, 3693-3697. Pakarian, P., & Yasamy, M. (2003). Wagon-wheel illusion under steady illumination: real of illusory? Perception, 32, 1`307-1310. ___________________________________________________ Stephen L. Black, Ph.D. tel: (819) 822-9600 ext 2470 Department of Psychology fax: (819) 822-9661 Bishop's University e-mail: [EMAIL PROTECTED] Lennoxville, QC J1M 1Z7 Canada Dept web page at http://www.ubishops.ca/ccc/div/soc/psy TIPS discussion list for psychology teachers at http://faculty.frostburg.edu/psyc/southerly/tips/index.htm _______________________________________________ --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]
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