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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 *** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.ccp4.ac.uk *** 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 *** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.ccp4.ac.uk *** >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.
