> So my overall conclusion is that for unknown reasons, a simple red
> square on PowerPoint elicits an after-image of blue rather than green, at
> least in my hands. It must have something to do with the way in which
> PowerPoint generates the colour. I'm going to stick to overhead projector
> d
I want to thank everyone who responded both publicly and privately
to my request for help in demonstrating opponent-process after-images.
I found the suggestions very helpful, and I appreciated receiving the
PowerPoint slides some sent along. I probably have enough American
flags for an invasion
Stephen Black writes on 27 Oct 99,:
> Preparatory to a big song-and-dance (or dog-and-pony show, take your
> pick) about the opponent-process theory of colour vision, I opened
> with a demonstration of complementary after-images, using PowerPoint
> to display them. It was underwhelmi
At 12:29 PM 10/27/1999 -0400, Kenneth M. Steele wrote:
>> Another thing; why the dark background? I think it might work better on
>> a light background (at least, that's how it works using the overhead
>> projector).
>>
>I agree with Bob, go to a white background.
>
Okay, now I'm curious... I d
On Wed, 27 Oct 1999 10:29:48 -0400 (EDT) Bob Keefer
<[EMAIL PROTECTED]> wrote:
>
> I don't use PowerPoint (don't have the equipment readily available), but
> I do use this demonstration. I have a heart and an American flag in
> 'opponent' colors on overheads. One thing I know you need to do
In defense of PowerPoint, I have used an afterimage demonstration using a
PowerPoint presentation. I have one slide that is the "standard" American
Flag (in "opponent" colors) with a dot in the middle. The flag takes up
the entire slide. After the students have fixated on the dot for 30
seconds
en Black wrote:
> Preparatory to a big song-and-dance (or dog-and-pony show, take your
> pick) about the opponent-process theory of colour vision, I opened
> with a demonstration of complementary after-images, using PowerPoint
> to display them. It was underwhelming. Very few agreed t
--
>From: Stephen Black <[EMAIL PROTECTED]>
>To: TIPS <[EMAIL PROTECTED]>
>Subject: How do I get those @#$%& complementary after-images?
>Date: Wed, Oct 27, 1999, 9:12 AM
>
> Preparatory to a big song-and-dance (or dog-and-pony show, take your
> pick)
On Wed, 27 Oct 1999, Stephen Black wrote:
> I displayed them as a rectangle covering about 10% of the screen, on a
> dark background, exposed for about 30 sec. They looked for the
> after-image against a white screen. The room was dim.
>
> Any suggestions as to how to get an optimum effect? Ide
Preparatory to a big song-and-dance (or dog-and-pony show, take your
pick) about the opponent-process theory of colour vision, I opened
with a demonstration of complementary after-images, using PowerPoint
to display them. It was underwhelming. Very few agreed that they saw
the "co
TED]>
To: TIPS <[EMAIL PROTECTED]>
Sent: Tuesday, October 19, 1999 10:52 AM
Subject: After Images
> A student asked:
>
> If color deficits such as protanopia are due to deficient cones, is
it still
> possible that these individuals could perceive accurate 'after
images
A student asked:
If color deficits such as protanopia are due to deficient cones, is it still
possible that these individuals could perceive accurate 'after images' due
to an intact opponent-process system?
I assumed that they would not, but I'm not completely s
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