Does anonymity give rise to hostility?

I made the opposite experience: on my home wiki, I participate under my real name since 2005 and never had problems with personal attacks based on the fact that people could look into my eyes. And I can't see how "inviting" people to share some information about their interests (which are quite obvious after they've made the first 50 edits) fuels the potential for personal attacks.

Moreover, a growing number of people complains (on blogs, in interviews, etc.) about the fact that Wikipedia feels emotionally cold and "misses the chance to give itself a personal face".

But aside from anecdotes and rumours – how can we measure the effects of improving the human side of Wikipedia?