Re: monitor refresh rates & epilepsy


Subject: Re: monitor refresh rates & epilepsy
From: Richard Wentk (richard@skydancer.com)
Date: Mon Jan 17 2005 - 16:47:56 EST


At 21:31 17/01/2005, you wrote:

>If I remember this now the Burroughs/Gysin Dream Machine had a frequency
>between 8-12Hz (intended to correspond to the alpha waves of the brain).
>
>I think you can find DIY instructions on the net, but it is *not*
>receommended for anyone having epilepsy or similar problems.
>
>As for a suitable computer display - perhaps a LCD-screen with long decay
>time?

I thought it was more like Hz rather than 10s of Hz.

A 60 or 70Hz CRT is bloody annoying to look at, but not particularly likely
to induce epilepsy.

A very simple way to do that is to build a simple box with two LEDs that
flash at different frequencies in the alpha range. Build a shade so each
eye can only see one LED and off you go.

I haven't tried this personally, and I don't recommend that people do. (And
if they do they're solely responsible for the consequences!)

Richard



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