David K. Hogberg, PhD
Professor of Psychology, Emeritus
Albion College, Albion MI 49224
[EMAIL PROTECTED] home phone: 517/629-4834
>>> [EMAIL PROTECTED] 04/18/04 15:53 PM >>>
RE: CIWWE (Constant Illumination Wagon Wheel Effect)
I'm putting my money on good vibrations... not the new-age kind,
but genuine physical vibrations, which may cause the visual system to
saccade in a rhythmic way. Recall that Purves et al. reminded us that
saccades do break up our phenomenally continuous visual experience into
discrete fixations. If our eyes were saccading at a frequency matching
the rotation speed (or at an even multiple or integral fraction), we
would achieve a stroboscopic effect even under constant illumination.
My bet is that one can get the CIWWE if one applies a vibration to the
skull while observing. Thus one could plausibly get it while riding in
a car, but not while standing still.
It's pouring rain at the moment, but if tomorrow is nice I'm going
to get out my own bicycle and try it.
This is probably related to a phenomenon I noted several years ago,
in an airport. Observing the poor-quality video on a closed-circuit
camera, I found that if I clicked my teeth together the picture would
partially black out. I'm pretty sure the tooth-clicking caused a visual
jump, blocking out a portion of the slow CRT scan.
It all hangs together. .. I think.
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