I haven't paid as careful attention to this discussion as I might, but I was wondering about critical flicker fusion and the role it could play. Does it have any bearing here> Carol
-----Original Message----- From: Donald McBurney [mailto:[EMAIL PROTECTED] Sent: Tue 4/20/2004 10:38 AM To: Teaching in the Psychological Sciences Cc: Subject: Re: Wagon-wheel illusion again Now that we are all congratulating ourselves on figuring out stroboscopic motion with steady illumination, let me throw a monkey wrench into the discussion. Could it be the result of torsional nystagmus, which is (I think) rotation around the line of sight? There is abnormal torsional nystagmus (and a Google search turned up tons of stuff), but it runs in my mind that there is a normal torsional nystagmus that would tend to keep a rotating object (such as a wheel) stable on the retina (analogous to vestibular nystagmus in the horizontal plane). don Donald McBurney As usual, I don't have time to research this, but maybe Stephen does. ;-) Ken Steele wrote: > Tom: Congratulations! > > Tom Allaway wrote: > >> To all, but especially Stephen, Doug and David: >> >> I do believe I've got it! The demonstration experiment involved, in >> my case, a small kitchen device similar to a salad spinner, containing a >> rotating perforated plastic tub. When spun under a flourescent light, >> it showed a clear "wagon wheel effect" (i.e., the temporary appearance >> and reverse rotation of the perforations during deceleration). I took >> it outside, and there was no effect to be observed. The crucial test: >> with my only source being daylight, I applied to my skull a vibratory >> stimulus, in the form of the business end of an electric toothbrush >> (minus the brush part) pressed against my chin. Violets! There was the >> wagon wheel effect! >> Q.E.D. >> >> Let's hear it for empiricism. >> >> --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]
<<winmail.dat>>
--- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]
