This document summarizes three studies on automatic assimilation of nonverbal gestures in virtual environments: 1) A 2005 study found that mimicked behaviors by virtual agents increased their social presence and the user's positive impression, but this effect decreased if users noticed the mimicry. 2) A 2008 study showed users found agents less trustworthy and friendly when they detected mirror mimicry behaviors. 3) A 2010 study found that while facial similarity between users and agents did not affect responses, agents perceived as helpful rather than obstacles led to more positive user involvement, connection and willingness to use the agent again.