Volunterering for Perceptual Rivalry Research:  If you enjoyed these demonstrations and would like to participate actively in the enjoyable and topical area of resarch, please contacy Bonnie Sheppard  at the University of Queensland, email :-
 
   b.sheppard@uq.edu.au.

You will be paid for your participation. Since we are investigating the effect of mood and mood disorders on perceptual rivalry, we particularly welcome volunteers who may have altered moods.