Fascinating post. Based on your response to Cathy: "In that VR world, the lecturer showed us how he can program the crowd to boo, throw things, clap, roar with laughter etc." ... it seems depending on who is using this psych technology, it could be used for good or evil. (Oh, oh, sounding a little Star Wars-y) Sorry, hee. Thanks for the info -- if my fear of all things crwcly-eraepy gets too out of control, I'll be giving you a call!