Some references for you
Wiki Brainstorming and Problems with Wiki Based Collaboration
http://www-users.cs.york.ac.uk/~kimble/teaching/students/Jonathan_Davies/Jonathan_Davies.html
Structuring Time and Task in Electronic Brainstorming, by Alan R. Dennis, Jay E. Aronson, William G. Heninger and Edward D. Walker, II MIS Quarterly © 1999 Management Information Systems Research Center, University of Minnesota.(Available at JSTOR)
Another source would be to look at the research link on http://wikieducator.org/Research