Re: Burroughs, Strobes (was Re: monitor refresh rates & epilepsy)


Subject: Re: Burroughs, Strobes (was Re: monitor refresh rates & epilepsy)
From: miriam clinton (iriXx) (iriXx@iriXx.org)
Date: Mon Jan 17 2005 - 21:51:52 EST


Richard Wentk wrote:

> At 23:12 17/01/2005, you wrote:
>
>> i must be unusual then... i see strobes at 60 - 75Hz...
>
>
> Depends what you mean by 'see' and 'strobes'. Anyone who waves their
> hand in front of a CRT refreshing at 90Hz will see a strobing effect.
> But it's very rare to experience 60Hz refresh as continuous extreme
> strobing of the sort you get at lower rates from a strobe light.
>
> One reason is that a CRT isn't really strobing at all, in the sense of
> the picture being switched full on and then followed by full off.
>
> The other is that 70Hz is way faster than anything the brain can
> process as discrete chunks. Visually it's a very similar effect to the
> one where above a certain frequency, a clickstream is perceived as a
> continuous tone.

strangely enough, if i'm feeling sensetive to a seizure coming on, or
sometimes otherwise, i see a throbbing effect.

i definately see throbbing at 60Hz, regardless of impending seizures or
not.

even at 85Hz today i can see the screen refresh - yeah i'm aware its
pixels constantly re-drawing, rather than a traditional 'strobe', but
i'm acutely aware of it.... but then again i've had a pretty bad time of
it in the last couple of days and have hardly been able to sit at a
computer other than short bursts of emailing.

>
>> then again, i hear whistles on tv sets when they're on stand-by....
>> and i can hear high frequencies above average...
>
>
> It's been a while since I've been anywhere near a TV, so I have no
> idea if this is true for me or not.
>
> I can hear different noiseshaping types quite clearly. Most of those
> have different kinds of mush in the very high treble, but what I'm
> listening for is something different to that.

yes... the high extremes is where i have acute hearing also. strange,
because a medication i took destroyed one of the aural nerves - the one
which runs from your forehead to your cochlea (through the temporal
lobes of course, which play a v. important in all this epilepsy/bipolar
stuff). that's pretty disturbing for me as a classical singer - i focus
my voice in the middle of my forehead. but thats a physical feeling on
sensation resonating on bone- and in any case i'm probably
overcompensating. it left me deaf in the mid-lower baritone range-
around middle C down to G. very annoying when trying to have a
conversation in the street, because passing cars are around this
frequency. difficult to mix, too, i have to have a 2nd pair of ears
check it out. but strangely enough i've retained my upper level hearing
- this must come from the eardrum directly.

i tend to be pretty attune to noiseshape/effects - not entirely sure of
what you're describing though and i'm very curious to know about it...
i've tuned myself in to tiny noises in soundscape - most likely because
a lot of my music is this psychoacoustic stuff (which Kris will tell you
is pretty freaky haha...)

mC~

>
>
>
>

-- 
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