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Hello all. There are multiple causes for motion sickness. The
phenomenon has been well studied by NASA since many astronauts have
this problem. I used to have a reference for a person working in this
field, but I would have to dig through some old boxes of papers to
find it and I'm not at home right now. My guess is that you are
having the same problem that users of virtual reality head-mounted
displays often have. It is a result of conflicting motion cues that
the brain receives. When the field of view moves, (like a camera
panning along a landscape), the inner ear expects to detect head
motion. If the two cues do not correspond, you get sick. One
possible way to reduce the problem might be to move your eye away
from the eyepiece. This will reduce your field of view in the scope
but might allow your brain see that you are not actually moving.
Blinking while the field is moving also sounds like a great idea. I
used to take powdered ginger root for motion sickness and it seemed
to work. There are modern drugs of course.
Just as an interesting side comment, you might notice after looking
at moving fields for a long period of time that the room appears to
move in the opposite direction when you look up from the scope. You
might also experience some vertigo. The brain has ways of adapting
to imperfections in vision and perception. When you finish working at
the scope, it takes a few minutes for your brain to re-adapt to reality.
Richard Gillilan
MacCHESS
Cornell University
On Jul 4, 2006, at 1:03 PM, Bernhard Rupp wrote:
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The phenomenon is actually known as 'flicker vertigo'.
It happens with rapid and periodic changes of light intensity.
Examples: looking through a slowly idling propeller on aircraft,
driving through an alley with tree shadows at low sun etc..
BR
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of
Engh, Richard
Sent: Tuesday, July 04, 2006 3:20 AM
To: Jon Marles-Wright; David Pratt; [email protected]
Subject: RE: [ccp4bb]: 'Motion sickness' and screening crystal trays
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You can use a programmed stepping motor driven plate holder, and
close your
eyes while it is moving. We sometimes did this before we purchased a
commercial imager. This also increases eye blinking frequency,
sometimes
useful if you are otherwise too curious to find crystals quickly...
Rick
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Jon
Marles-Wright
Sent: Tuesday, July 04, 2006 11:58 AM
To: David Pratt; [email protected]
Subject: RE: [ccp4bb]: 'Motion sickness' and screening crystal trays
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Apologies for the rather strange post... I seem to get what feels
like
motion sickness when I am checking 96-well crystal trays (doesn't
seem
to happen with 24-well manual trays).
I get the same thing when I move the plate too fast. I find that
checking
the wells in columns rather than rows seems to mitigate most of the
feeling
of motion sickness. For some reason the scrolling side-to-side is
more
unpleasant than up-down scrolling.
Jon.
