At 07:34 AM 10/02/97 +0000, you wrote:
>Hi
>The television uses a refresh of 25 frames per second.  Does your tv flicker?
>
>Tim

All TV's flicker.

Some people notice this flicker - others do not. Depends on a whole range of
factors. I believe every persons brain has a built in clock rate of around
20 to 40 cycles per second. There is a basic minimum response time which
is considered to be a certain multiple of the human clock rate. Thats one
reason that sprinters (in the olympics) are considered to have a false
start if there response rate is less than 75mS AFTER the gun !

There seems to be some correlation between metabolic rate and a persons
likelihood to notice flicker. My girlfriend was diagnosed with a thyroid
condition that has kept her metabolic rate slow for years - since she
has been on medication she notices flicker on some SVGA monitors where she
would'nt notice it before...

Personally I can't stand anything below about 60Hz on a SVGA but put up with
a TV at 25 since its a smallish screen and the intensity is downand I think
the phosphor persistence is a bit longer ?

Rgds

Mike