Thanks for the quick responses.  A colleague has run in to some difficulty doing a study of biological motion (people watching someone wearing lights positioned on the body.  He wants the subjects to see the lighted person thru a one-way mirror (that's a problem in that the room being viewed is dark and the small lites just reflect off the surface of the one-way mirror and the subject viewing in the observational room can't see!).  He wanted to videotape the motion with a video camera but the camera can't "see" in the dark ha.  (maybe a camera buff can suggest something?)  He wants the subjects to be watching this thru the one-way mirror but sitting in red light so they can see.  But then does he need to have the subjects sit for at least thirty minutes in total darkness to get full rod adaptation first?  And will the red lite interfere with rod sensitivity?  Some fun questions I thought.  Since he is cognitive,  and I am social psych--we have our limits.  Appreciate any help or ideas.  Gary
 
 
 
Gerald L. (Gary) Peterson, Ph.D.
Professor, Psychology
Saginaw Valley State University
989-964-4491
[EMAIL PROTECTED]
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