There exist many different opinions and miscellaneous researches regarding to Moris theory about the “Uncanny Valley” - meaning the effect, when human likeness and eeriness stand in a non-linear relationship for the appearance of robots and virtual faces. Some of them depict that motion do not affect the valley in any way, but they implied it wrongly for interactions. In this thesis we wanted to investigate in the change of behaviour, when humans interact with virtual 3D avatars. Therefore we recorded various animation of a real human and mapped them onto virtual faces. Then we designed an experiment with 18 participants, who were shown four different inanimated computer generated faces and afterwards the same faces animated for an interaction, in a random order. The interaction was made with a game called “WHO AM I?”, where they slip into the role of a well known character and than had to figure out through “yes” or “no” questions who they are. After each inanimated face as well as after each interaction they had to fulfil a questionnaire, to rate human likeness, eeriness and attractiveness of the virtual avatars. We evaluated significant positive effects of human likeness and attractiveness due to interactions with computer generated avatars.