Hmmmmmm,

Southern California, pavement swaying?

We call that earthquakes !!!   :)

-----Original Message-----
From: David T Darnell [mailto:[log in to unmask]]
Sent: Tuesday, February 05, 2002 2:40 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] Visual perception and list messages


Right! I've exerienced that as well! After a day of sailing off the
Southern California shore (in a little 24' "Gladiator"), back on land, it
felt like the pavement was swaying under us. BTW - that little boat took us
to a lot of overnighters at various islands.

-dtd




Tracy Pierce <[log in to unmask]>@RAVEN.UTC.EDU> on 02/05/2002 02:27:25
PM

Please respond to Tracy Pierce <[log in to unmask]>

Sent by:  HP-3000 Systems Discussion <[log in to unmask]>


To:   [log in to unmask]
cc:
Subject:  Re: [HP3000-L] Visual perception and list messages


it's also called sea-legs, in an appropriate context.



> -----Original Message-----
> From: Wirt Atmar [mailto:[log in to unmask]]
> Sent: Tuesday, February 05, 2002 1:01 PM
> To: [log in to unmask]
> Subject: Re: Visual perception and list messages
>
>
> David asks:
>
> > When I was a kid and we rode down the freeway in the back
> of mom's station
> >  wagon facing back, we noticed a phenomenon we called
> "getting velocitized";
> >  for a minute or two after the car stopped, we perceived
> that everything was
> >  moving toward us. This seems directly related to
> "habituation", but, what
> >  so we call it?
> >
> >  No, wiseguys, it wasn't carbon monoxide!
>
> It's called the "motion-after effect," or more commonly, the
> "waterfall
> effect." See:
>
>     http://www.biols.susx.ac.uk/home/George_Mather/Motion/MAE.HTML
>
> ...and you're correct, it is related to habituation. Your
> brain, your CNS, as
> well as all of your peripheral nervous system, and in fact all of
> evolutionary adaptation, operates in the same manner, in a
> constant mode of
> prediction of the next symbols in a string. In all of these systems, a
> "model" is constructed/evolved in either neuronal or genic
> memory of the next
> most likely symbol in a string of symbols to appear. If the
> actual symbol
> that is presented to you is different than the expected, a
> difference signal
> of some sort is created, indicating the intensity of the
> novelty of the event.
>
> Shannon's information metric, I = pi log(pi), is no more than
> a measure of
> this "unexpectedness" of the next symbol in the string,
> although Shannon
> deduced the importance of this very simple truth a half
> billion years after
> evolution did.
>
> The "water-fall effect" occurs because your brain has taken
> on a particular
> expectation of the world around you, and once you've stopped
> the car, it
> takes a little while for this model to be proved wrong and
> fade away. But for
> that small bit of time, the world dances around you.
>
> Wirt Atmar
>
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