CRT vs. LCD

[Michiel Spape]

One thing though:
"you never see an entire, let's say circle but your brain makes you see it as the point and lines are drawn so rapidly."

Psychologists, like me, like to bring the brain into the picture (if not, the mind), but (correct me if I'm wrong - I tend to forget my high school knowledge!) the eyes (or at least the cones in the retina) can't 'see' the difference either. The important thing for many an experiment, therefore, is not whether the stuff stays on the screen for X ms, but whether it stays on the retina for as long - show a word for 20 ms on whatever monitor, followed by a blank screen, and you can easily read it. Show the same word, but now with a nice mask after it - not so much.

Anyway, I use CRT screens, as long as I can still get them (don't know if that will be too long), usually at 100 Hz. I'm doing a lot of experiments with circles and whatnot moving across the screen, running at a semi-perpetual loop at 100 Hz, so it kind of matters what screen I use (though it doesn't matter much, I guess, as people don't see much of a difference between 100 Hz moving (my experiment), 50 Hz (TV, I think?) and 25 Hz (Flash default). Also, if you like to save stuff at each refresh (say, eye tracking data, mouse cursor position during a continuous response experiment), it starts getting important just how often this is.

Cheers,
Mich
 

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Tobias
Sent: 04 March 2010 14:40
To: E-Prime
Subject: CRT vs. LCD

I had a discussion yesterday with a collegue from another lab about
display types. I am always using CRT displays for my experiments
because they have higher refresh rates and no decay in which color
values might differ from what you programmed.
However, this guy was bringing forward an argument I have not thought
about so far: For LCDs you have a stable overall picture at any given
moment. A CRT display virtually draws one point after another, i.e.
you never see an entire, let's say circle but your brain makes you see
it as the point and lines are drawn so rapidly. I was shown photos
made by a digital camera with really short shutter times (less than 5
ms) and for CRT displays you can never see entire stimuli whereas for
LCDs you do.

So I was wondering what kind of display you are using in your labs and
what your experiences are. Maybe there will develop a fruitful
discussion.

Cheers,
Tobias

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