The current state of semi-automated facial animation demands better understanding of how facial expressions are produced by real people. As a first step of a series of empirical studies, we investigated snapshots of facial expressions of the six basic emotions, produced by 18 subjects in `out of context' sessions. The MPEG-4 coded vectors were analysed on principal components and canonical variates, which served as a basis to draw conclusions about the (for the negative emotions: lack of) generic characteristics of the six emotions and their mutual distances. Our results are compared to ones obtained by facial image analysis and human perception researchers.

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Information Systems [INS]
Visualization and 3D User Interfaces

Hendrix, J, & Ruttkay, Z.M. (2000). Exploring the space of emotional faces of subjects without acting experience. Information Systems [INS]. CWI.