[FOM] colour or colours
Paul Hollander
paul at paulhollander.com
Sun Nov 6 12:28:54 EST 2005
Richard Heck, 9:17 PM -0500 10/31/05:
>Suppose Bob says, "That ink is blue". Suppose context shifts and he
>now says "That ink is not blue". Has Bob contradicted himself? Have
>his beliefs changed? Not necessarily, and certainly that's not how
>Searle wants us to take the example. It's the context that's
>shifted, not Bob's beliefs.
A.R.D.Mathias, 5:10 AM +0400 11/2/05:
>I haven't checked recently but there was a time when under certain
>conditions (usually when I was fatigued and had been lying on one
>side for some time) my two eyes perceived hues, if not colours,
>differently. One would see an object as a rich red, the other as a
>watery red. Which eye was correct? I always assumed it was
>something to do with differences in the blood supply to the
>two eyes, as if I changed position to lie on my other side, the eyes
>would, given a little time, exchange perceptions.
Anyone who uses color thought experiments in philosophy should be
aware of the work of David Williams at U. of Rochester. Williams
provides evidence that color perception, as measured by having
subjects calibrate a light source to pure yellow, has both greater
regularity and greater plasticity than can be explained by eye
physiology alone.
A recent press release from U. of Rochester
(http://www.rochester.edu/news/show.php?id=2299) describes William's
two most recent findings:
"Williams and a postdoctoral fellow Yasuki Yamauchi, working with
other collaborators from the Medical College of Wisconsin, gave
several people colored contacts to wear for four hours a day. While
wearing the contacts, people tended to eventually feel as if they
were not wearing the contacts, just as people who wear colored
sunglasses tend to see colors "correctly" after a few minutes with
the sunglasses. The volunteers' normal color vision, however, began
to shift after several weeks of contact use. Even when not wearing
the contacts, they all began to select a pure yellow that was a
different wavelength than they had before wearing the contacts."
'"We were able to precisely image and count the color-receptive cones
in a living human eye for the first time, and we were astonished at
the results," says David Williams, Allyn Professor of Medical Optics
and director of the Center for Visual Science. "We've shown that
color perception goes far beyond the hardware of the eye, and that
leads to a lot of interesting questions about how and why we perceive
color."'
-paul
Paul J. Hollander
Visiting Lecturer
Corning Community College
Corning, NY
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